Difference between revisions of "Medical kidney diseases"

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This article describes '''medical renal disease''' or the '''medical kidney'''.  Much in medical kidney depends on the clinical information.  Most of the disease seen by pathologists is... glomerular disease.  If in doubt... the answer to most questions is ''[[diabetes mellitus]]'' or ''[[systemic lupus erythematosus]]''.  Medical kidney is niche area in pathology.  It is one of the few areas that routinely requires [[electron microscopy]].
[[Image:Acute thrombotic microangiopathy - pas - very high mag.jpg|250px|thumb|[[Micrograph]] showing a glomerulus with an [[thrombotic microangiopathy|acute thrombotic microangiopathy]]. [[PAS stain]].]]
This article describes '''medical renal disease''' or the '''medical kidney'''.  Much in medical kidney depends on the clinical information.  Most of the disease seen by pathologists is... glomerular disease. It is one of the few areas that routinely requires [[electron microscopy]].
   
Medical kidney is niche area in pathology. In the context of exams for general pathologists, if in doubt... the answer to most questions is ''[[diabetes mellitus]]'' or ''[[systemic lupus erythematosus]]''.   


Kidney tumours are dealt with in the ''[[kidney tumours]]'' article, and ''[[pediatric kidney tumours]]'' article.
Kidney tumours are dealt with in the ''[[kidney tumours]]'' article, and ''[[pediatric kidney tumours]]'' article.  


=Clinical=
=Clinical=
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Notes:
Notes:
*Dinosaurs use the units mg/dL; normal with these units is: 0.8 to 1.4 mg/dL.<ref>URL: [http://www.nlm.nih.gov/medlineplus/ency/article/003475.htm http://www.nlm.nih.gov/medlineplus/ency/article/003475.htm]. Accessed on: 8 November 2010.</ref>
*In some parts of the world they use the units mg/dL; normal with these units is: 0.8 to 1.4 mg/dL.<ref>URL: [http://www.nlm.nih.gov/medlineplus/ency/article/003475.htm http://www.nlm.nih.gov/medlineplus/ency/article/003475.htm]. Accessed on: 8 November 2010.</ref>
*Conversion: 1.0 mg/dL = 88.4 umol/L.<ref>URL: [http://www.sydpath.stvincents.com.au/other/Conversions/ConversionMasterF3.htm http://www.sydpath.stvincents.com.au/other/Conversions/ConversionMasterF3.htm]. Accessed on: 8 November 2010.</ref><ref>URL: [http://www.unc.edu/~rowlett/units/scales/clinical_data.html http://www.unc.edu/~rowlett/units/scales/clinical_data.html]. Accessed on: 8 November 2010.
*Conversion: 1.0 mg/dL = 88.4 umol/L.<ref>URL: [http://www.sydpath.stvincents.com.au/other/Conversions/ConversionMasterF3.htm http://www.sydpath.stvincents.com.au/other/Conversions/ConversionMasterF3.htm]. Accessed on: 8 November 2010.</ref><ref>URL: [http://www.unc.edu/~rowlett/units/scales/clinical_data.html http://www.unc.edu/~rowlett/units/scales/clinical_data.html]. Accessed on: 8 November 2010.
</ref>
</ref>
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Cut points:<ref>URL: [http://www.fpnotebook.com/urology/lab/urnprtntcrtnrt.htm http://www.fpnotebook.com/urology/lab/urnprtntcrtnrt.htm]. Accessed on: 8 November 2010.</ref>
Cut points:<ref>URL: [http://www.fpnotebook.com/urology/lab/urnprtntcrtnrt.htm http://www.fpnotebook.com/urology/lab/urnprtntcrtnrt.htm]. Accessed on: 8 November 2010.</ref>
*Normal (2 years and older): <0.2 g protein / g Creatinine
*Normal (2 years and older): <0.2 g protein / g Creatinine
*Nephrotic range: >3.5 g protein / g Creatinine.  
*[[Nephrotic syndrome|Nephrotic]] range: >3.5 g protein / g Creatinine.  


===Complement===
===Complement===
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*Changed:
*Changed:
**[[Systemic lupus erythematosus]] (SLE); levels decreased = increased disease activity.  
**[[Systemic lupus erythematosus]] (SLE); levels decreased = increased disease activity.  
**Post-infectious GN - decreased.
**[[Post-infectious GN]] - decreased.
**MPGN - decreased. (???)
**[[MPGN]] - decreased. (???)
**Infection.<ref name=pmid3892188>{{cite journal |author=Nusinow SR, Zuraw BL, Curd JG |title=The hereditary and acquired deficiencies of complement |journal=Med. Clin. North Am. |volume=69 |issue=3 |pages=487–504 |year=1985 |month=May |pmid=3892188 |doi= |url=}}</ref><ref>URL: [http://www.google.com/url?sa=t&source=web&cd=3&sqi=2&ved=0CB0QFjAC&url=http%3A%2F%2Fwww.beckmancoulter.com%2Fliterature%2FClinDiag%2FBulletin%25209282C3_C4.pdf&rct=j&q=C3%2C%20C4%20decreased%2C%20l&ei=0evYTPLHHcX9ngfetNDzCQ&usg=AFQjCNFR26FHyAmy4lZ3tm-tLgW-oD73Zg&cad=rja beckmancoulter.com]. Accessed on: 9 November 2010.</ref>
**Infection.<ref name=pmid3892188>{{cite journal |author=Nusinow SR, Zuraw BL, Curd JG |title=The hereditary and acquired deficiencies of complement |journal=Med. Clin. North Am. |volume=69 |issue=3 |pages=487–504 |year=1985 |month=May |pmid=3892188 |doi= |url=}}</ref><ref>URL: [http://www.google.com/url?sa=t&source=web&cd=3&sqi=2&ved=0CB0QFjAC&url=http%3A%2F%2Fwww.beckmancoulter.com%2Fliterature%2FClinDiag%2FBulletin%25209282C3_C4.pdf&rct=j&q=C3%2C%20C4%20decreased%2C%20l&ei=0evYTPLHHcX9ngfetNDzCQ&usg=AFQjCNFR26FHyAmy4lZ3tm-tLgW-oD73Zg&cad=rja beckmancoulter.com]. Accessed on: 9 November 2010.</ref>
**Hemolytic [[anemia]].<ref name=pmid3892188>{{cite journal |author=Nusinow SR, Zuraw BL, Curd JG |title=The hereditary and acquired deficiencies of complement |journal=Med. Clin. North Am. |volume=69 |issue=3 |pages=487–504 |year=1985 |month=May |pmid=3892188 |doi= |url=}}</ref><ref>URL: [http://www.google.com/url?sa=t&source=web&cd=3&sqi=2&ved=0CB0QFjAC&url=http%3A%2F%2Fwww.beckmancoulter.com%2Fliterature%2FClinDiag%2FBulletin%25209282C3_C4.pdf&rct=j&q=C3%2C%20C4%20decreased%2C%20l&ei=0evYTPLHHcX9ngfetNDzCQ&usg=AFQjCNFR26FHyAmy4lZ3tm-tLgW-oD73Zg&cad=rja beckmancoulter.com]. Accessed on: 9 November 2010.</ref>
**Hemolytic [[anemia]].<ref name=pmid3892188>{{cite journal |author=Nusinow SR, Zuraw BL, Curd JG |title=The hereditary and acquired deficiencies of complement |journal=Med. Clin. North Am. |volume=69 |issue=3 |pages=487–504 |year=1985 |month=May |pmid=3892188 |doi= |url=}}</ref><ref>URL: [http://www.google.com/url?sa=t&source=web&cd=3&sqi=2&ved=0CB0QFjAC&url=http%3A%2F%2Fwww.beckmancoulter.com%2Fliterature%2FClinDiag%2FBulletin%25209282C3_C4.pdf&rct=j&q=C3%2C%20C4%20decreased%2C%20l&ei=0evYTPLHHcX9ngfetNDzCQ&usg=AFQjCNFR26FHyAmy4lZ3tm-tLgW-oD73Zg&cad=rja beckmancoulter.com]. Accessed on: 9 November 2010.</ref>
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**Previously p-ANCA.
**Previously p-ANCA.
**Seen in ANCA-[[vasculitides]], esp. [[microscopic polyangiitis]].  
**Seen in ANCA-[[vasculitides]], esp. [[microscopic polyangiitis]].  
*PR3-ANPA (proteinase 3 antineutrophil cytoplasmic autoantibody).  
*PR3-ANCA (proteinase 3 antineutrophil cytoplasmic autoantibody).  
**Previously c-ANCA.
**Previously c-ANCA.
**Seen in ANCA-[[vasculitides]], esp. [[Wegener granulomatosis]].
**Seen in ANCA-[[vasculitides]], esp. [[granulomatosis with polyangiitis]] (Wegener granulomatosis).


===C4d===
===C4d===
*Suggests humoral immunity (antibody-mediated immunity) at play.
*Suggests humoral immunity (antibody-mediated immunity) at play.
*Important in monitoring of renal transplant recipients.
*Important in monitoring of renal transplant recipients.
*Immunostain also available - see below.
*[[Immunostain]] also available - see below.


===Other blood work===
===Other blood work===
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====Mixed====
====Mixed====
*Features of nephritic syndrome and nephrotic syndrome.
*Features of nephritic syndrome and [[nephrotic syndrome]].


=Clinical DDx=
=Clinical DDx=
==Renal failure 101==
*Prerenal.
**Shock - cardiogenic, hypovolemic, neurogenic, septic, anaphylatic.
*Renal.
**What this article deals with.
*Postrenal.
**Outflow obstruction, e.g. [[prostatic nodular hyperplasia]] ([[AKA]] BPH).
==Renal causes==
*Isolated hematuria.
*Isolated proteinuria.
*Nephrotic syndrome.
*Nephritis syndrome.
*Rapidly progressive glomerulonephritis.
*Chronic renal failure.
*A combination of any of the above.
The clinical presentations suggest a pathologic DDx.<ref>URL: [http://www.emedicine.com/med/topic886.htm http://www.emedicine.com/med/topic886.htm] and [http://www.emedicine.com/ped/topic1564.htm http://www.emedicine.com/ped/topic1564.htm]. Accessed on: 8 November 2010.</ref>
The clinical presentations suggest a pathologic DDx.<ref>URL: [http://www.emedicine.com/med/topic886.htm http://www.emedicine.com/med/topic886.htm] and [http://www.emedicine.com/ped/topic1564.htm http://www.emedicine.com/ped/topic1564.htm]. Accessed on: 8 November 2010.</ref>


===Nephritic===
===Isolated hematuria===
*Post-infectious glomerulonephritis.
*[[IgA nephropathy]].<ref name=pmid19949735>{{Cite journal  | last1 = Kim | first1 = BS. | last2 = Kim | first2 = YK. | last3 = Shin | first3 = YS. | last4 = Kim | first4 = YO. | last5 = Song | first5 = HC. | last6 = Kim | first6 = YS. | last7 = Choi | first7 = EJ. | title = Natural history and renal pathology in patients with isolated microscopic hematuria. | journal = Korean J Intern Med | volume = 24 | issue = 4 | pages = 356-61 | month = Dec | year = 2009 | doi = 10.3904/kjim.2009.24.4.356 | PMID = 19949735 }}</ref>
*[[Alport syndrome]].
*[[Thin glomerular basement membrane disease]].
 
===Proteinuria===
*[[Diabetic nephropathy]].
*Classic causes of nephrotic syndrome:
**[[FSGS]].
**[[MCD]].
**[[MN]].
*Paraprotein-related:
**[[Renal amyloidosis]].
**Monoclonal immunoglobulin deposition disease (MIDD).
*Weird stuff:
**[[Fibrillary glomerulopathy]].
**[[Immunotactoid glomerulopathy]].
 
===Nephritic syndrome===
Classic:
*[[Post-infectious glomerulonephritis]].
**Classically streptococcal.
**Classically streptococcal.
*Crescentic glomerulonephritis ([[AKA]] rapidly progressive glomerulonephritis (RPGN)).
*Crescentic glomerulonephritis ([[AKA]] rapidly progressive glomerulonephritis (RPGN)).


====RPGN====  
Others:
*[[IgA nephropathy]].
*[[Lupus nephritis]].
 
====Rapidly progressive glomerulonephritis====  
Classification:<ref>URL: [http://bestpractice.bmj.com/best-practice/monograph/207/basics/classification.html http://bestpractice.bmj.com/best-practice/monograph/207/basics/classification.html]. Accessed on: 17 November 2011.</ref>
Classification:<ref>URL: [http://bestpractice.bmj.com/best-practice/monograph/207/basics/classification.html http://bestpractice.bmj.com/best-practice/monograph/207/basics/classification.html]. Accessed on: 17 November 2011.</ref>
#Linear immune deposits.
#Linear immune deposits.
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#**[[Microscopic polyangiitis]].
#**[[Microscopic polyangiitis]].


===Nephrotic===
===Nephrotic syndrome===
*Minimal segmental disease (MSD) - [[AKA]] ''minimal change disease'' (MCD).  
*Minimal segmental disease (MSD) - [[AKA]] ''minimal change disease'' (MCD).  
*[[Focal segmental glomerulosclerosis]] (FSGS).  
*[[Focal segmental glomerulosclerosis]] (FSGS).  
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*[[Membranoproliferative glomerulonephritis]] (MPGN).
*[[Membranoproliferative glomerulonephritis]] (MPGN).


=Normal=
=Normal kidney=
===Cells of the glomerulus===
===Cells of the glomerulus===
*Podocytes.
*Podocytes.
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**Another autopsy series suggests the mean diameter is: 225 micrometers.<ref>{{Cite journal  | last1 = Nyengaard | first1 = JR. | last2 = Bendtsen | first2 = TF. | title = Glomerular number and size in relation to age, kidney weight, and body surface in normal man. | journal = Anat Rec | volume = 232 | issue = 2 | pages = 194-201 | month = Feb | year = 1992 | doi = 10.1002/ar.1092320205 | PMID = 1546799 }}</ref>
**Another autopsy series suggests the mean diameter is: 225 micrometers.<ref>{{Cite journal  | last1 = Nyengaard | first1 = JR. | last2 = Bendtsen | first2 = TF. | title = Glomerular number and size in relation to age, kidney weight, and body surface in normal man. | journal = Anat Rec | volume = 232 | issue = 2 | pages = 194-201 | month = Feb | year = 1992 | doi = 10.1002/ar.1092320205 | PMID = 1546799 }}</ref>


Note:
*If the glomerulus fills half the field at 40x on a microscope with 22 mm diameter eye pieces it is ~ 0.275 mm or 275 micrometers.
====Glomerular basement membrane====
====Glomerular basement membrane====
The glomerular basement membrane (GBM) should be thinner than the tubular basement membrane.
The glomerular basement membrane (GBM) should be thinner than the tubular basement membrane.
===Images===
<gallery>
Image: Benign kidney -- very low mag.jpg | Benign kidney - very low mag.
Image: Benign kidney -- low mag.jpg | Benign kidney - low mag.
Image: Benign kidney - alt -- low mag.jpg | Benign kidney - low mag.
Image: Benign kidney -- intermed mag.jpg | Benign kidney - intermed. mag.
</gallery>


=Basic approach to renal biopsy=
=Basic approach to renal biopsy=
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*Interstitium.
*Interstitium.
*Vessels.
*Vessels.
Memory device ''GI TV'': glomeruli, interstitium, tubules, vessels.


===Glomeruli===
===Glomeruli===
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*Count the number of glomeruli.
*Count the number of glomeruli.
*Count number of the obsolete glomeruli.
*Count number of the obsolete glomeruli.
Notes:
*Endocapillary hypercellularity has a DDx - it includes: [[IgA nephropathy]],<ref name=pmid21258273>{{Cite journal  | last1 = Grcevska | first1 = L. | last2 = Ristovska | first2 = V. | last3 = Nikolov | first3 = V. | last4 = Petrusevska | first4 = G. | last5 = Milovanceva-Popovska | first5 = M. | last6 = Polenakovic | first6 = M. | title = The Oxford classification of IgA nephropathy: single centre experience. | journal = Prilozi | volume = 31 | issue = 2 | pages = 7-16 | month = Dec | year = 2010 | doi =  | PMID = 21258273 }}</ref> and [[lupus nephritis]].<ref name=pmid6975091>{{Cite journal  | last1 = Jothy | first1 = S. | last2 = Sawka | first2 = RJ. | title = Presence of monocytes in systemic lupus erythematosus-associated glomerulonephritis: marker study and significance. | journal = Arch Pathol Lab Med | volume = 105 | issue = 11 | pages = 590-3 | month = Nov | year = 1981 | doi =  | PMID = 6975091 }}</ref>


====Components of the glomeruli (anatomical)====
====Components of the glomeruli (anatomical)====
*Podocyte - rarely affect by disease  
*Podocyte - rarely affect by disease  
**One notable disease is ''collapsing glomerulopathy'' in [[HIV]].<ref>AH. 13 August 2009.</ref>
**One notable disease is ''[[collapsing glomerulopathy]]'' in [[HIV]].<ref>AH. 13 August 2009.</ref>
*Endothelial cell.
*Endothelial cell.
*Mesangial cell.
*Mesangial cell.
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Consider:
Consider:
*Vasculitis? - inflammatory cells in vessel wall.
*[[Vasculitis]]? - inflammatory cells in vessel wall.
*Amyloid? - pink.
*[[Amyloid]]? - pink.
*Rejection? - PMNs.
*Rejection? - [[PMN]]s.
*Cholesterol emboli?
*[[Cholesterol emboli]]?


====Arteriolar hyalinosis====
====Arteriolar hyalinosis====
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*'''A'''ging, '''D'''iabetes, '''H'''ypertension, '''D'''rugs.
*'''A'''ging, '''D'''iabetes, '''H'''ypertension, '''D'''rugs.


Image:
=====Image=====
*[http://commons.wikimedia.org/wiki/File:Renal_arterial_hyalinosis_-_he_-_very_high_mag.jpg Arterial hyaline - HE - very high mag. (WC)].
<gallery>
*[http://commons.wikimedia.org/wiki/File:Renal_arterial_hyalinosis_-_pas_-_very_high_mag.jpg Arterial hyaline - PAS - very high mag. (WC)].
Image:Renal_arterial_hyalinosis_-_he_-_very_high_mag.jpg | Arterial hyaline - HE - very high mag. (WC/Nephron)
*[http://commons.wikimedia.org/wiki/File:Renal_arterial_hyalinosis_-_hps_-_very_high_mag.jpg Arterial hyaline - HPS - very high mag. (WC)].
Image:Renal_arterial_hyalinosis_-_pas_-_very_high_mag.jpg | Arterial hyaline - PAS - very high mag. (WC/Nephron)
Image:Renal_arterial_hyalinosis_-_hps_-_very_high_mag.jpg | Arterial hyaline - HPS - very high mag. (WC/Nephron)
</gallery>


====Atherosclerosis====
====Atherosclerosis====
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Can be:
Can be:
*Subepithelial - distal to basement membrane (BM), closer to the urinary space.
*Subepithelial - distal to basement membrane (BM), closer to the urinary space.
**[[Membranous nephropathy]], [[Post-infectious glomerulonephritis]] (hump-like), [[MPGN]].
*Subendothelial - proximal to BM, closer to the glomerular capillary.
*Subendothelial - proximal to BM, closer to the glomerular capillary.
 
**[[MPGN]] - classic location.


==Pathologic differential diagnosis==
==Pathologic differential diagnosis==
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===Mesangial expansion===
===Mesangial expansion===
*A patch of matrix can contain more than three mesangial cell nuclei.
**Highly subjective.
DDx:
DDx:
*Diabetes mellitus.<ref name=pmid17418688>{{cite journal |author=Fioretto P, Mauer M |title=Histopathology of diabetic nephropathy |journal=Semin. Nephrol. |volume=27 |issue=2 |pages=195-207 |year=2007 |month=March |pmid=17418688 |doi=10.1016/j.semnephrol.2007.01.012 |url=}}</ref>
*[[Diabetes mellitus]].<ref name=pmid17418688>{{cite journal |author=Fioretto P, Mauer M |title=Histopathology of diabetic nephropathy |journal=Semin. Nephrol. |volume=27 |issue=2 |pages=195-207 |year=2007 |month=March |pmid=17418688 |doi=10.1016/j.semnephrol.2007.01.012 |url=}}</ref>
*Immune complex mediated disease
*MPGN:
**[[IgA nephropathy]].
**[[IgA nephropathy]].
**[[Henoch-Schoenlein purpura]].
**[[Henoch-Schoenlein purpura]].
**[[Lupus nephritis]].
**[[Lupus nephritis]].
*[[Fibrillary glomerulopathy]].
*[[Immunotactoid glomerulopathy]].
*[[Renal amyloidosis]].
*Monoclonal immunoglobulin deposition disease.


===Glomerular crescents===
===Glomerular crescents===
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===Primary light microscopy patterns===
===Primary light microscopy patterns===
{| class="wikitable sortable" style="margin-left:auto;margin-right:auto"
{| class="wikitable sortable" style="margin-left:auto;margin-right:auto"
| '''Pattern'''
! Pattern
| '''Key feature'''
! Key feature
| '''Other findings'''
! Other findings
| '''DDx of the pattern'''
! DDx of the pattern
| '''DDx'''
! DDx
| '''Image'''
! Image
|-
|-
|Normal light microscopy
|Normal light microscopy
| Normal histology
| Normal histology
| none
| none ''or'' few glomeruli in a biopsy of an under sampled FSGS
| [[membranous nephropathy]], FSGS
| [[membranous nephropathy]], [[focal segmental glomerulosclerosis]] (FSGS)
| normal kidney, [[minimal change disease]], [[thin glomerular basement membrane disease]], [[Alport syndrome]], early [[membranous nephropathy]]
| normal kidney, [[minimal change disease]], [[thin glomerular basement membrane disease]], [[Alport syndrome]], early [[membranous nephropathy]]
| Image?
| [[Image:Benign kidney -- intermed mag.jpg|thumb|center|150px|Benign kidney (WC)]]
|-
|-
|Nodular mesangial expansion
|Nodular mesangial expansion
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| GBM thickening, both afferent and efferent arteriole hyalinized
| GBM thickening, both afferent and efferent arteriole hyalinized
| diffuse proliferative GN, membranous nephropathy
| diffuse proliferative GN, membranous nephropathy
| [[diabetic nephropathy]], [[idiopathic nodular glomerulosclerosis]], [[amyloidosis]], light chain deposition disease
| [[diabetic nephropathy]], [[idiopathic nodular glomerulosclerosis]], [[renal amyloidosis]], light chain deposition disease, [[fibrillary glomerulopathy]], [[immunotactoid glomerulopathy]]
| [http://commons.wikimedia.org/wiki/File:Nodular_glomerulosclerosis.jpeg (WC)]
| [[Image:Nodular_glomerulosclerosis.jpeg|thumb|center|150px|Nodular GS (WC)]]
|-
|-
|[[Membranous nephropathy]] (MN)
|[[Membranous nephropathy]] (MN)
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| normal light microscopy, light chain deposition disease
| normal light microscopy, light chain deposition disease
| [[hepatitis B]], [[hepatitis C]], carcinoma, NSAID toxicity, SLE, idiopathic (MN); light chain deposition disease ([[plasma cell neoplasm]])
| [[hepatitis B]], [[hepatitis C]], carcinoma, NSAID toxicity, SLE, idiopathic (MN); light chain deposition disease ([[plasma cell neoplasm]])
| [http://commons.wikimedia.org/wiki/File:Membranous_nephropathy_-_mpas_-_very_high_mag.jpg (WC)]  
| [[Image:Membranous_nephropathy_-_mpas_-_very_high_mag.jpg|thumb|center|150px|MN (WC)]]  
|-
|-
|[[Focal segmental glomerulosclerosis]]
|[[Focal segmental glomerulosclerosis]]
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| +/-glomerular enlargement, +/- tuft-capsule adhesions
| +/-glomerular enlargement, +/- tuft-capsule adhesions
| [[rapidly progressive glomerulonephritis]], nodular mesangial expansion
| [[rapidly progressive glomerulonephritis]], nodular mesangial expansion
| primary FSGS, secondary FSGS ([[HIV]], [[IVDU]], obesity, [[parvovirus B19]], [[Alport syndrome]]
| primary FSGS, secondary FSGS ([[HIV]], [[IVDU]], [[obesity]], [[parvovirus B19]], [[Alport syndrome]]
| [http://commons.wikimedia.org/wiki/File:Focal_segmental_glomerulosclerosis_-_high_mag.jpg (WC)]
| [[Image:Focal_segmental_glomerulosclerosis_-_high_mag.jpg|thumb|center|150px|FSGS (WC)]]
|-
|-
|Diffuse proliferative glomerulonephritis
|Diffuse proliferative glomerulonephritis
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| nodular glomerulosclerosis
| nodular glomerulosclerosis
| [[post-infectious glomerulonephritis]], [[MPGN]], [[dense deposit disease]], diffuse proliferative [[lupus nephritis]] (class IV), cryoglobulinemic GN
| [[post-infectious glomerulonephritis]], [[MPGN]], [[dense deposit disease]], diffuse proliferative [[lupus nephritis]] (class IV), cryoglobulinemic GN
| [http://commons.wikimedia.org/wiki/File:Membranoproliferative_glomerulonephritis_-_very_high_mag.jpg (WC)]
| [[Image:Membranoproliferative_glomerulonephritis_-_very_high_mag.jpg|thumb|center|150px|MPGN (WC)]]
|-  
|-  
|[[Rapidly progressive glomerulonephritis]]
|[[Rapidly progressive glomerulonephritis]]
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| [[FSGS]], diffuse proliferative glomerulonephritis
| [[FSGS]], diffuse proliferative glomerulonephritis
| [[AGBM]], [[post-infectious glomerulonephritis]], pauci-immune GN, immune complex diseases ([[lupus nephritis]], [[IgA nephropathy]], others)
| [[AGBM]], [[post-infectious glomerulonephritis]], pauci-immune GN, immune complex diseases ([[lupus nephritis]], [[IgA nephropathy]], others)
| [http://en.wikipedia.org/wiki/File:Crescentic_glomerulonephritis_%282%29.jpg (WC)]
| [[Image:Crescentic_glomerulonephritis_%282%29.jpg|thumb|center|150px|Crescentic GN (WC)]]
|-
|-
|Tubular injury
|Tubular injury
Line 437: Line 506:
| normal light microscopy
| normal light microscopy
| [[acute tubular necrosis]], [[chronic allograft nephropathy]]
| [[acute tubular necrosis]], [[chronic allograft nephropathy]]
| [http://commons.wikimedia.org/wiki/File:Chronic_allograft_nephropathy_-_intermed_mag.jpg (WC)]
| [[Image:Chronic_allograft_nephropathy_-_intermed_mag.jpg|thumb|center|150px|CAN (WC)]]
|-
|-
|Small vessel pathology
|Small vessel pathology
Line 444: Line 513:
| none
| none
| [[thrombotic microangiopathy]] (malignant hypertension, [[scleroderma]] renal crisis, DIC, HUS, TTP,
| [[thrombotic microangiopathy]] (malignant hypertension, [[scleroderma]] renal crisis, DIC, HUS, TTP,
| [http://commons.wikimedia.org/wiki/File:Renal_arterial_hyalinosis_-_pas_-_very_high_mag.jpg hyalinosis (WC)], [http://commons.wikimedia.org/wiki/File:Thrombotic_microangiopathy_-_very_high_mag.jpg TMA (WC)]
| [[Image:Renal_arterial_hyalinosis_-_pas_-_very_high_mag.jpg |thumb|center|150px| Hyalinosis (WC)]] [[Image:Thrombotic_microangiopathy_-_very_high_mag.jpg|thumb|center|150px| TMA (WC)]]
|-
|-
|Large vessel pathology
|Large vessel pathology
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| none
| none
| [[atherosclerosis]], [[cholesterol embolism]], other types of embolism, [[thrombosis]]
| [[atherosclerosis]], [[cholesterol embolism]], other types of embolism, [[thrombosis]]
| [http://commons.wikimedia.org/wiki/File:Cholesterol_embolus_-_intermed_mag.jpg (WC)]
| [[Image:Cholesterol_embolus_-_intermed_mag.jpg |thumb|center|150px| Cholesterol embolus (WC)]]
|- <!--
|- <!--
| Pattern
| Pattern
Line 463: Line 532:
===Diagnoses - Table===
===Diagnoses - Table===
{| class="wikitable sortable" style="margin-left:auto;margin-right:auto"
{| class="wikitable sortable" style="margin-left:auto;margin-right:auto"
| '''Pattern'''
! Pattern
| '''Key feature'''
! Key feature
| '''Other findings'''
! Other findings
| '''IF & EM'''
! IF & EM
| '''Presentation'''
! Presentation
| '''Clinical'''
! Clinical
| '''Pathol. DDx'''
! Pathol. DDx
| '''Image'''
! Image
|-
|-
|[[Nodular glomerulosclerosis]]
|[[Nodular glomerulosclerosis]]
Line 476: Line 545:
| GBM thickening, both afferent and efferent arteriole hyalinized
| GBM thickening, both afferent and efferent arteriole hyalinized
| EM?
| EM?
| nephrotic (???)
| proteinuria - typical presentation, nephrotic syndrome{{fact}}
| [[diabetes mellitus]] (DM)
| [[diabetes mellitus]] (DM)
| [[amyloidosis]], [[idiopathic nodular glomerulosclerosis]] (nodular GS without DM)
| [[amyloidosis]], [[idiopathic nodular glomerulosclerosis]] (nodular GS without DM)
| [http://commons.wikimedia.org/wiki/File:Nodular_glomerulosclerosis.jpeg (WC)]
| [[Image:Nodular_glomerulosclerosis.jpeg|thumb|center|150px|Nodular GS (WC)]]
|-
|-
|[[Focal segmental glomerulosclerosis]] (FSGS)
|[[Focal segmental glomerulosclerosis]] (FSGS)
Line 488: Line 557:
| primary FSGS, secondary FSGS ([[HIV]], [[IVDU]], obesity, [[parvovirus B19]], [[Alport syndrome]]); unresponsive to steroids, worse prognosis than MCD
| primary FSGS, secondary FSGS ([[HIV]], [[IVDU]], obesity, [[parvovirus B19]], [[Alport syndrome]]); unresponsive to steroids, worse prognosis than MCD
| [[minimal change disease]]
| [[minimal change disease]]
| [http://commons.wikimedia.org/wiki/File:Focal_segmental_glomerulosclerosis_-_high_mag.jpg (WC)]
| [[Image:Focal_segmental_glomerulosclerosis_-_high_mag.jpg|thumb|center|150px|FSGS (WC)]]
|-
|-
|[[Membranous nephropathy]]<br>(AKA membranous GN)
|[[Membranous nephropathy]]<br>(AKA membranous GN)
Line 497: Line 566:
| [[hepatitis B]], [[hepatitis C]], carcinoma, NSAID toxicity, SLE, idiopathic
| [[hepatitis B]], [[hepatitis C]], carcinoma, NSAID toxicity, SLE, idiopathic
| Nodular glomerulosclerosis (?)
| Nodular glomerulosclerosis (?)
| [http://www.flickr.com/photos/jian-hua_qiao_md/3989875091/in/set-72157622411941607 silver stain (flickr.com)]
| [[Image:Membranous_nephropathy_-_mpas_-_very_high_mag.jpg|thumb|center|150px|MN (WC)]]  
|-
|-
|[[Minimal change disease]] (MCD)
|[[Minimal change disease]] (MCD)
Line 515: Line 584:
| primary vs. secondary (Henoch-Schoenlein purpura)
| primary vs. secondary (Henoch-Schoenlein purpura)
| [[RPGN]]
| [[RPGN]]
| [http://commons.wikimedia.org/wiki/File:Henoch-Sch%C3%B6nlein_nephritis_IgA_immunostaining.jpg (WC)]
| [[Image:Henoch-Sch%C3%B6nlein_nephritis_IgA_immunostaining.jpg|thumb|center|150px|HSN - IgA IHC (WC)]]
|-
|-
|[[Membranoproliferative glomerulonephritis]] (MPGN)
|[[Membranoproliferative glomerulonephritis]] (MPGN)
Line 522: Line 591:
| subepithelial deposits
| subepithelial deposits
| mixed nephrotic/nephritic
| mixed nephrotic/nephritic
| [[SLE]], cryoglobulinemia, [[hepatitis B]], [[hepatitis C]]
| [[SLE]], [[cryoglobulinemia]], [[hepatitis B]], [[hepatitis C]]
| Pathol. DDx?
| Pathol. DDx?
| [http://commons.wikimedia.org/wiki/File:Membranoproliferative_glomerulonephritis_-_very_high_mag.jpg (WC)]
| [[Image:Membranoproliferative_glomerulonephritis_-_very_high_mag.jpg|thumb|center|MPGN (WC)]]
|-
|-
|[[Focal proliferative glomerosclerosis|Focal proliferative<br> glomerosclerosis]] (FPGS)
|[[Focal proliferative glomerosclerosis|Focal proliferative<br> glomerosclerosis]] (FPGS)
Line 545: Line 614:
|-  
|-  
| [[Dense deposit disease]]
| [[Dense deposit disease]]
| linear C3 with rings
| IF: linear C3 with rings
| +/-thick GBM
| +/-thick GBM
| EM: GBM lamina densa thickening
| EM: GBM lamina densa thickening
Line 565: Line 634:
===Diffuse proliferative glomerulonephritis===
===Diffuse proliferative glomerulonephritis===
{| class="wikitable sortable" style="margin-left:auto;margin-right:auto"
{| class="wikitable sortable" style="margin-left:auto;margin-right:auto"
| '''Pattern'''
! Pattern
| '''Key feature'''
! Key feature
| '''Clinical'''
! Clinical
|-
|-
| [[Post-infectious glomerulonephritis]]
| [[Post-infectious glomerulonephritis]]
Line 574: Line 643:
|-
|-
| [[Membranoproliferative glomerulonephritis]] (MPGN)
| [[Membranoproliferative glomerulonephritis]] (MPGN)
|
| mesangial proliferation with thickening of the glomerular capillary loops<ref name=pmid11682680>{{Cite journal  | last1 = Smet | first1 = AD. | last2 = Kuypers | first2 = D. | last3 = Evenepoel | first3 = P. | last4 = Maes | first4 = B. | last5 = Messiaen | first5 = T. | last6 = Van Damme | first6 = B. | last7 = Vanrenterghem | first7 = Y. | title = 'Full house' positive immunohistochemical membranoproliferative glomerulonephritis in a patient with portosystemic shunt. | journal = Nephrol Dial Transplant | volume = 16 | issue = 11 | pages = 2258-62 | month = Nov | year = 2001 | doi =  | PMID = 11682680 | URL = http://ndt.oxfordjournals.org/cgi/pmidlookup?view=long&pmid=11682680 }}</ref>
 
| low C3, normal C4; primary vs. secondary (often hepatitis C)
| low C3, normal C4; primary vs. secondary (often hepatitis C)
|-
|-
| [[Dense deposit disease]]
| [[Dense deposit disease]]
|
| IF: linear C3 with rings
|
|  
|-
|-
| [[Cryoglobulinemic glomerulonephritis]]
| [[Cryoglobulinemic glomerulonephritis]]
Line 600: Line 670:
*Due to [[diabetes mellitus]] - '''key feature'''.
*Due to [[diabetes mellitus]] - '''key feature'''.
**If there is no history of diabetes... it is ''[[idiopathic nodular glomerulosclerosis]]''.
**If there is no history of diabetes... it is ''[[idiopathic nodular glomerulosclerosis]]''.
*Most common cause of end stage renal disease (ESRD).
*Most common cause of [[end-stage renal disease]] (ESRD).
*Biopsied only if the (clinical) features are atypical.
*Biopsied only if the (clinical) features are atypical.


Line 609: Line 679:
*Mesangial matrix expansion - leads to nodule formation ''Kimmelstiel-Wilson nodules'' (''nodular glomerulosclerosis'').
*Mesangial matrix expansion - leads to nodule formation ''Kimmelstiel-Wilson nodules'' (''nodular glomerulosclerosis'').


Other:
Others:
*Armanni-Ebstein change - cytoplasmic vacuolization of tubular cells (usu. loop of Henle) -- innermost cortex, outer medulla;<ref name=pmid13478656>{{cite journal |author=RITCHIE S, WAUGH D |title=The pathology of Armanni-Ebstein diabetic nephropathy |journal=Am. J. Pathol. |volume=33 |issue=6 |pages=1035–57 |year=1957 |pmid=13478656 |pmc=1934668 |doi= |url=http://www.ncbi.nlm.nih.gov/pmc/articles/PMC1934668/?page=1}}</ref> not specific to diabetes mellitus.<ref name=pmid20875709>{{cite journal |author=Zhou C, Byard RW |title=Armanni-Ebstein phenomenon and hypothermia |journal=Forensic Sci Int |volume= |issue= |pages= |year=2010 |month=September |pmid=20875709 |doi=10.1016/j.forsciint.2010.08.018 |url=}}</ref>
*Armanni-Ebstein change = cytoplasmic vacuolization of tubular cells (usu. loop of Henle) -- innermost cortex, outer medulla;<ref name=pmid13478656>{{cite journal |author=Ritchie S, Waugh D |title=The pathology of Armanni-Ebstein diabetic nephropathy |journal=Am. J. Pathol. |volume=33 |issue=6 |pages=1035–57 |year=1957 |pmid=13478656 |pmc=1934668 |doi= |url=http://www.ncbi.nlm.nih.gov/pmc/articles/PMC1934668/?page=1}}</ref> not specific to diabetes mellitus.<ref name=pmid20875709>{{cite journal |author=Zhou C, Byard RW |title=Armanni-Ebstein phenomenon and hypothermia |journal=Forensic Sci Int |volume= |issue= |pages= |year=2010 |month=September |pmid=20875709 |doi=10.1016/j.forsciint.2010.08.018 |url=}}</ref>
*Capsular drop = hyaline material deposited in the Bowman's capsule.<ref name=ndt-edu>URL: [http://www.ndt-educational.org/ferrariodiabete.asp http://www.ndt-educational.org/ferrariodiabete.asp]. Accessed on: 29 April 2012.</ref>
*Fibrin cap = subendothelial deposition of hyaline material.<ref name=ndt-edu/>


Other - with weak evidence:
Other - with weak evidence:
Line 616: Line 688:


Memory device:
Memory device:
*GBM = ''thick '''G'''BM'', '''''b'''oth afferent & efferent artiole thickened'', '''''m'''esangial matrix expansion''.
*GBM = ''thick '''G'''BM'', '''''b'''oth afferent & efferent arterioles thickened'', '''''m'''esangial matrix expansion''.


Images:  
====Images====
*[http://commons.wikimedia.org/wiki/File:Nodular_glomerulosclerosis.jpeg Nodular glomerulosclerosis (WC)].
<gallery>
Image:Diabetic_glomerulosclerosis_%281%29_HE.jpg | Diabetic glomerulosclerosis. (WC/KGH)
Image:Diabetic_glomerulosclerosis_(2)_HE.jpg | Diabetic glomerulosclerosis. (WC/KGH)
Image:Diabetic_glomerulosclerosis_%283%29_HE.jpg | Diabetic glomerulosclerosis. (WC/KGH)
Image:Nodular_glomerulosclerosis.jpeg | Nodular glomerulosclerosis. (WC)
</gallery>
www:
*[http://library.med.utah.edu/WebPath/jpeg1/RENAL027.jpg Nodular GS (med.utah.edu)].
*[http://library.med.utah.edu/WebPath/jpeg1/RENAL027.jpg Nodular GS (med.utah.edu)].
*[http://www.markwickmd.com/images/pages/armani_ebstein_lesion.jpg Armanni-Ebstein lesion (markwickmd.com)].
*[http://www.markwickmd.com/images/pages/armani_ebstein_lesion.jpg Armanni-Ebstein lesion (markwickmd.com)].
Line 682: Line 760:
**Class IV is essentially a dead kidney - doesn't get biopsied.
**Class IV is essentially a dead kidney - doesn't get biopsied.


Images:
====Images====
*[http://commons.wikimedia.org/wiki/File:SLE_Nephritis_Pathology_Diagram.svg SLE nephritis - schematic (WC)].
<gallery>
Image:SLE_Nephritis_Pathology_Diagram.svg| SLE nephritis - schematic. (WC)
</gallery>
*Membranous lupus:
*Membranous lupus:
**[http://www.flickr.com/photos/jian-hua_qiao_md/3989875425/in/set-72157622411941607 H&E (flickr.com)].
**[http://www.flickr.com/photos/jian-hua_qiao_md/3989875425/in/set-72157622411941607 H&E (flickr.com)].
Line 691: Line 771:
=Nephrotic syndrome=
=Nephrotic syndrome=
{{Main|Nephrotic syndrome}}
{{Main|Nephrotic syndrome}}
This includes the following:
This classically includes the following:
*[[Minimal change disease]].
*[[Minimal change disease]].
*[[Focal segmental glomerulosclerosis]].
*[[Focal segmental glomerulosclerosis]].
*[[Membranous nephropathy]].
*[[Membranous nephropathy]].
It also includes:
*[[IgA nephropathy]].
*Pre-eclampsia - uncommon.<ref name=pmid20033418>{{Cite journal  | last1 = Wei | first1 = Q. | last2 = Zhang | first2 = L. | last3 = Liu | first3 = X. | title = Outcome of severe preeclampsia manifested as nephrotic syndrome. | journal = Arch Gynecol Obstet | volume = 283 | issue = 2 | pages = 201-4 | month = Feb | year = 2011 | doi = 10.1007/s00404-009-1338-z | PMID = 20033418 }}</ref>


=Mixed nephrotic and nephritic=
=Mixed nephrotic and nephritic=
Line 703: Line 787:
*More common in Asians.
*More common in Asians.
*Associated with an increased incidence of [[Celiac disease]].<ref name=pmid19332868>{{Cite journal  | last1 = Smerud | first1 = HK. | last2 = Fellström | first2 = B. | last3 = Hällgren | first3 = R. | last4 = Osagie | first4 = S. | last5 = Venge | first5 = P. | last6 = Kristjánsson | first6 = G. | title = Gluten sensitivity in patients with IgA nephropathy. | journal = Nephrol Dial Transplant | volume = 24 | issue = 8 | pages = 2476-81 | month = Aug | year = 2009 | doi = 10.1093/ndt/gfp133 | PMID = 19332868 }}</ref>  
*Associated with an increased incidence of [[Celiac disease]].<ref name=pmid19332868>{{Cite journal  | last1 = Smerud | first1 = HK. | last2 = Fellström | first2 = B. | last3 = Hällgren | first3 = R. | last4 = Osagie | first4 = S. | last5 = Venge | first5 = P. | last6 = Kristjánsson | first6 = G. | title = Gluten sensitivity in patients with IgA nephropathy. | journal = Nephrol Dial Transplant | volume = 24 | issue = 8 | pages = 2476-81 | month = Aug | year = 2009 | doi = 10.1093/ndt/gfp133 | PMID = 19332868 }}</ref>  
*''IgA nephropathy'', in children, with a skin rash ([[leukocytoclastic vasculitis]]) = [[Henoch–Schönlein purpura]].
*May present as [[nephrotic syndrome]].<ref name=pmid7849391>{{Cite journal  | last1 = Komatsuda | first1 = A. | last2 = Wakui | first2 = H. | last3 = Yasuda | first3 = T. | last4 = Imai | first4 = H. | last5 = Miura | first5 = AB. | last6 = Tsuda | first6 = A. | last7 = Nakamoto | first7 = Y. | title = Successful delivery in a pregnant women with crescentic IgA nephropathy. | journal = Intern Med | volume = 33 | issue = 11 | pages = 723-6 | month = Nov | year = 1994 | doi =  | PMID = 7849391 }}</ref><ref name=pmid22322610>{{Cite journal  | last1 = Kim | first1 = JK. | last2 = Kim | first2 = JH. | last3 = Lee | first3 = SC. | last4 = Kang | first4 = EW. | last5 = Chang | first5 = TI. | last6 = Moon | first6 = SJ. | last7 = Yoon | first7 = SY. | last8 = Yoo | first8 = TH. | last9 = Kang | first9 = SW. | title = Clinical features and outcomes of IgA nephropathy with nephrotic syndrome. | journal = Clin J Am Soc Nephrol | volume = 7 | issue = 3 | pages = 427-36 | month = Mar | year = 2012 | doi = 10.2215/CJN.04820511 | PMID = 22322610 }}</ref>
*May present as isolated hematuria.<ref name=pmid19949735>{{Cite journal  | last1 = Kim | first1 = BS. | last2 = Kim | first2 = YK. | last3 = Shin | first3 = YS. | last4 = Kim | first4 = YO. | last5 = Song | first5 = HC. | last6 = Kim | first6 = YS. | last7 = Choi | first7 = EJ. | title = Natural history and renal pathology in patients with isolated microscopic hematuria. | journal = Korean J Intern Med | volume = 24 | issue = 4 | pages = 356-61 | month = Dec | year = 2009 | doi = 10.3904/kjim.2009.24.4.356 | PMID = 19949735 }}</ref>


===Microscopic===
===Microscopic===
Line 712: Line 799:
*Diagnosis based on immunofluorescence (IgA+).
*Diagnosis based on immunofluorescence (IgA+).


Image: [http://library.med.utah.edu/WebPath/jpeg2/RENAL096.jpg IgA nephropathy (med.utah.edu)].
====Images====
 
*[http://library.med.utah.edu/WebPath/jpeg2/RENAL096.jpg IgA nephropathy (med.utah.edu)].
*[http://path.upmc.edu/cases/case96.html HSP (upmc.edu)].
<gallery>
Image:Henoch-Sch%C3%B6nlein_nephritis_IgA_immunostaining.jpg | HSP - IgA IHC (WC)
</gallery>
====Scoring====
====Scoring====
IgA nephropathy can be scored using an assessment of '''m'''esangial proliferation, '''e'''ndocapillary proliferation, glomerulo'''s'''clerosis and '''t'''ubular atrophy and interstitial fibrosis (abbreviated ''MEST'').<ref>{{Cite journal  | last1 = Coppo | first1 = R. | last2 = Cattran | first2 = D. | last3 = Roberts Ian | first3 = SD. | last4 = Troyanov | first4 = S. | last5 = Camilla | first5 = R. | last6 = Cook | first6 = T. | last7 = Feehally | first7 = J. | title = The new Oxford Clinico-Pathological Classification of IgA nephropathy. | journal = Prilozi | volume = 31 | issue = 1 | pages = 241-8 | month = Jul | year = 2010 | doi =  | PMID = 20693944 }}</ref>
IgA nephropathy can be scored using an assessment of '''m'''esangial proliferation, '''e'''ndocapillary proliferation, glomerulo'''s'''clerosis and '''t'''ubular atrophy and interstitial fibrosis (abbreviated ''MEST'').<ref>{{Cite journal  | last1 = Coppo | first1 = R. | last2 = Cattran | first2 = D. | last3 = Roberts Ian | first3 = SD. | last4 = Troyanov | first4 = S. | last5 = Camilla | first5 = R. | last6 = Cook | first6 = T. | last7 = Feehally | first7 = J. | title = The new Oxford Clinico-Pathological Classification of IgA nephropathy. | journal = Prilozi | volume = 31 | issue = 1 | pages = 241-8 | month = Jul | year = 2010 | doi =  | PMID = 20693944 }}</ref>


===IF===
===IF===
*IgA +ve -- branching pattern.
*IgA +ve in a branching pattern - '''diagnostic'''.


===EM===
===EM===
Line 728: Line 819:
*Old name ''MPGN type 1''.
*Old name ''MPGN type 1''.
===General===
===General===
Clinical:
*Nephrotic syndrome or nephrotic/nephritic syndrome.
Pathology:
*May be primary, i.e. idiopathic, or secondary, i.e. a consequence of another pathologic process.<ref name=pmid11682680>{{Cite journal  | last1 = Smet | first1 = AD. | last2 = Kuypers | first2 = D. | last3 = Evenepoel | first3 = P. | last4 = Maes | first4 = B. | last5 = Messiaen | first5 = T. | last6 = Van Damme | first6 = B. | last7 = Vanrenterghem | first7 = Y. | title = 'Full house' positive immunohistochemical membranoproliferative glomerulonephritis in a patient with portosystemic shunt. | journal = Nephrol Dial Transplant | volume = 16 | issue = 11 | pages = 2258-62 | month = Nov | year = 2001 | doi =  | PMID = 11682680 | URL = http://ndt.oxfordjournals.org/cgi/pmidlookup?view=long&pmid=11682680 }}</ref>
====Secondary causes====
*In adults most common cause: ''[[hepatitis C]]''.
*In adults most common cause: ''[[hepatitis C]]''.


Other causes:
Other causes:
*[[SLE]], cryoglobulinemia, [[hepatitis B]].
*[[HIV]].<ref name=pmid21743226>{{Cite journal  | last1 = Pakasa | first1 = NM. | last2 = Binda | first2 = PM. | title = HIV-associated immune complex glomerulonephritis with lupus-like features. | journal = Saudi J Kidney Dis Transpl | volume = 22 | issue = 4 | pages = 769-73 | month = Jul | year = 2011 | doi =  | PMID = 21743226 }}</ref>
*[[SLE]] - usu. has "full house" on IF.<ref name=pmid11682680/>
*Cryoglobulinemia.
*[[Hepatitis B]].
*Portocaval shunt.<ref name=pmid21743226/>


Clinical:
*Nephrotic syndrome or nephrotic/nephritic syndrome.
===Microscopic===
===Microscopic===
Features:
Features:
Line 744: Line 844:
*[[Nodular glomerulosclerosis]].
*[[Nodular glomerulosclerosis]].


Images:
====Images====
*[http://commons.wikimedia.org/wiki/File:Membranoproliferative_glomerulonephritis_-_intermed_mag.jpg MPGN - intermed. mag. (WC)].
<gallery>
*[http://commons.wikimedia.org/wiki/File:Membranoproliferative_glomerulonephritis_-_very_high_mag.jpg MPGN - very high mag. (WC)].
Image:Membranoproliferative_glomerulonephritis_-_intermed_mag.jpg | MPGN - intermed. mag. (WC/Nephron)
Image:Membranoproliferative_glomerulonephritis_-_very_high_mag.jpg | MPGN - very high mag. (WC/Nephron)
</gallery>
*[http://path.upmc.edu/cases/case593.html MPGN - several images (upmc.edu)].
 
===EM===
Features:
*Subendothelial immune deposits - classic finding.<ref name=pmid21839367>{{Cite journal  | last1 = Sethi | first1 = S. | last2 = Fervenza | first2 = FC. | title = Membranoproliferative glomerulonephritis: pathogenetic heterogeneity and proposal for a new classification. | journal = Semin Nephrol | volume = 31 | issue = 4 | pages = 341-8 | month = Jul | year = 2011 | doi = 10.1016/j.semnephrol.2011.06.005 | PMID = 21839367 }}</ref>
*Subepithelial immune deposits - historically considered uncommon.<ref name=pmid2263028>{{Cite journal  | last1 = Sato | first1 = H. | title = [Ultrastructural study on membranoproliferative glomerulonephritis with special reference to subepithelial deposits]. | journal = Nihon Jinzo Gakkai Shi | volume = 32 | issue = 9 | pages = 973-83 | month = Sep | year = 1990 | doi =  | PMID = 2263028 }}</ref>


==Dense deposit disease==
==Dense deposit disease==
Line 765: Line 873:


Images:
Images:
*[http://www.nature.com/modpathol/journal/v20/n6/fig_tab/3800773f1.html DDD (nature.com)].<ref name=pmid17396142/>
*[http://www.nature.com/modpathol/journal/v20/n6/fig_tab/3800773f1.html DDD - light microscopy (nature.com)].<ref name=pmid17396142/>
*[http://path.upmc.edu/cases/case148.html DDD - several images (upmc.edu)].


===IF===
===IF===
Line 771: Line 880:
*IgG negative.
*IgG negative.
*IgA negative
*IgA negative
Images:
*[http://www.nature.com/modpathol/journal/v20/n6/fig_tab/3800773f3.html#figure-title DDD - IF (nature.com)].


===EM===
===EM===
Line 804: Line 916:
*+/-[[Vasculitis]].
*+/-[[Vasculitis]].


Images:
====Images====
*WC - KGH:
<gallery>
**[http://commons.wikimedia.org/wiki/File:Crescentic_glomerulonephritis_%282%29.jpg RPGN (WC)].
Image:Crescentic_glomerulonephritis_%282%29.jpg | RPGN (WC/KGH)  
**[http://commons.wikimedia.org/wiki/File:Crescentic_glomerulonephritis_%281%29.jpg RPGN (WC)].
Image:Crescentic_glomerulonephritis_%281%29.jpg | RPGN (WC/KGH)
*WC:
Image:Crescentic_glomerulonephritis_-_intermed_mag.jpg | RPGN - intermed. mag. (WC/Nephron)
**[http://commons.wikimedia.org/wiki/File:Crescentic_glomerulonephritis_-_intermed_mag.jpg RPGN - intermed. mag. (WC)].
Image:Crescentic_glomerulonephritis_-_high_mag.jpg | RPGN - high mag. (WC/Nephron)
**[http://commons.wikimedia.org/wiki/File:Crescentic_glomerulonephritis_-_high_mag.jpg RPGN - high mag. (WC)].
</gallery>
 
==Post-infectious glomerulonephritis==
==Post-infectious glomerulonephritis==
===General===
*Abbreviated ''PIGN''.
*Classically post-streptococcal infection.
{{Main|Post-infectious glomerulonephritis}}
**Lab test: Antistreptolysin O titer (ASOT) +ve.
 
===Microscopic===
Features:
*+/-Neutrophils - in glomerulus.
*[[Glomerular crescents]].
 
Images:
*[http://commons.wikimedia.org/wiki/File:Acute_Glomerulonephritis_Pathology_Diagram.svg Post-infectious GN - schematic (WC)].
*[http://commons.wikimedia.org/wiki/File:Post-infectious_glomerulonephritis_-_high_mag.jpg Post-infectious GN - high mag. (WC)].
*[http://commons.wikimedia.org/wiki/File:Post-infectious_glomerulonephritis_-_very_high_mag.jpg Post-infectious GN - very high mag. (WC)].
 
===IF===
*Granular immune deposits.
 
===EM===
*Subepithelial deposits.


=Rare diseases=
=Rare diseases=
Line 837: Line 931:
*Abbreviated ''AGBM''.
*Abbreviated ''AGBM''.
===General===
===General===
*Known as '''Goodpasture disease''' ([[AKA]] '''Goodpasture syndrome'''), if renal failure is accompanied by pulmonary hemorrhage.<ref>{{cite journal | author=Goodpasture EW | title=The significance of certain pulmonary lesions in relation to the etiology of influenza | journal=Am J Med Sci | year=1919 | volume=158 | pages=863–870 | doi=10.1097/00000441-191911000-00012 | issue=6}}</ref>
*Known as '''Goodpasture disease''' ([[AKA]] '''Goodpasture syndrome'''), if renal failure is accompanied by [[pulmonary hemorrhage]].<ref>{{cite journal | author=Goodpasture EW | title=The significance of certain pulmonary lesions in relation to the etiology of influenza | journal=Am J Med Sci | year=1919 | volume=158 | pages=863–870 | doi=10.1097/00000441-191911000-00012 | issue=6}}</ref>
*Rare - estimated incidence 1/1-2 million.<ref name=pmid20962523/>
*Rare - estimated incidence 1/1-2 million.<ref name=pmid20962523/>
*[[Antibody mediated hypersensitivity]].
*[[Antibody mediated hypersensitivity]].
Line 843: Line 937:
**Associated with a specific HLA type (HLA-DRB1*1501) and two gene families.
**Associated with a specific HLA type (HLA-DRB1*1501) and two gene families.
**Antibodies directed against COL4A3,<ref>{{OMIM|120070}}</ref> which is ''not'' mutated.
**Antibodies directed against COL4A3,<ref>{{OMIM|120070}}</ref> which is ''not'' mutated.
*Oligouria - poor prognosticator.{{fact}}


Tx:
Tx:
Line 856: Line 951:
**Crescentic glomerulonephritis.
**Crescentic glomerulonephritis.


Images:
====Images====
*[http://commons.wikimedia.org/wiki/File:Crescentic_glomerulonephritis_-_intermed_mag.jpg RPGN - intermed. mag. (WC)].
<gallery>
*[http://commons.wikimedia.org/wiki/File:Crescentic_glomerulonephritis_-_high_mag.jpg RPGN - high mag. (WC)].
Image:Crescentic_glomerulonephritis_-_intermed_mag.jpg | RPGN - intermed. mag. (WC/Nephron)
Image:Crescentic_glomerulonephritis_-_high_mag.jpg | RPGN - high mag. (WC/Nephron)
</gallery>
www:
*[http://path.upmc.edu/cases/case541.html AGBM disease - several images (upmc.edu)].


===IF===
===IF===
*Linear IgG deposits - '''diagnostic'''.
*Linear IgG deposits - '''diagnostic'''.
*Fibrinogen in crescents.


DDx:
DDx:
*Goodpasture syndrome with the pulmonary hemorrhage.
*Goodpasture syndrome with the pulmonary hemorrhage.
Image:
*[http://path.upmc.edu/cases/case541/images/fig08.jpg Linear IgG in AGBM disease (upmc.edu)].


==Thin glomerular basement membrane disease==
==Thin glomerular basement membrane disease==
Line 906: Line 1,009:
===Microscopic===
===Microscopic===
Features:<ref name=pmid9727383/>
Features:<ref name=pmid9727383/>
*Normal.
*Usu. normal.
*+/-Foamy appearing renal tubular cells.<ref name=Ref_Klatt246>{{Ref Klatt|246}}</ref>


===IF===
===IF===
Line 935: Line 1,039:


==Fabry disease==
==Fabry disease==
===General===
{{Main|Fabry disease}}
*Rare X-linked genetic disease.
**Caused by defect in ''alpha-galactosidase A gene''.
**Women partially affected
*[[Lysosomal storage disorder]] -- 2nd in prevalence only to [[Gaucher disease]].
*Multisystem disease affecting small vessels and [[kidney]].
 
====Presentation====
*Women: usually proteinuria.
*Men: [[angiokeratoma]]s, proteinuria.
 
====Tx====
*Symptomatic treatment.
*Enzyme replacement - ''agalsidase alpha'' (Replagal) or ''agalsidase beta'' (Fabrazyme).
 
===Microscopic===
LM:<ref name=pmid16799480>{{cite journal |author=Fischer EG, Moore MJ, Lager DJ |title=Fabry disease: a morphologic study of 11 cases |journal=Mod. Pathol. |volume=19 |issue=10 |pages=1295-301 |year=2006 |month=October |pmid=16799480 |doi=10.1038/modpathol.3800634 |url=http://www.nature.com/modpathol/journal/v19/n10/abs/3800634a.html}}</ref>
*Foamy podocyte inclusions, best visualized with ''[[toluidine blue]]''.
*Mild mesangial hypercellularity.
 
EM:<ref name=pmid16799480/>
*Myelin-like inclusions.
**Concentric bodies with an onion-skin-like appearance.
*Zebra bodies.
**Ovoid inclusions with striped pattern.
 
Note:
*Myelin-like inclusion are not [http://en.wikipedia.org/wiki/Pathognomonic pathognomonic] for Fabry disease; they may result from drug use:<ref name=pmid16799480/>
**Amiodarone,
**Aminoglycosides,
**Chloroquine.


==Myeloma==
==Myeloma==
Line 977: Line 1,051:
====Microscopic====
====Microscopic====
Features:<ref>URL: [http://www.kidneypathology.com/English_version/Amyloidosis_and_others.html http://www.kidneypathology.com/English_version/Amyloidosis_and_others.html]. Accessed on: 9 November 2010.</ref>
Features:<ref>URL: [http://www.kidneypathology.com/English_version/Amyloidosis_and_others.html http://www.kidneypathology.com/English_version/Amyloidosis_and_others.html]. Accessed on: 9 November 2010.</ref>
*Crap in tubules.
*Crap in tubules, eosinophilic.
**Classically angulated.
**Refractile.
**Refractile.
*Cast with cellular reaction.
*Cast with cellular reaction - '''virtually diagnostic'''.
**Macrophages (CD68 +ve).
**Macrophages (CD68 +ve).


Images:
=====Images=====
*www:  
www:  
**[http://www.kidneypathology.com/Imagenes/Amiloidosis%20y/MM.3.w.jpg Cast nephropathy in myeloma (kidneypathology.com)].
*[http://www.kidneypathology.com/Imagenes/Amiloidosis%20y/MM.3.w.jpg Cast nephropathy in myeloma (kidneypathology.com)].
**[http://www.kidneypathology.com/Imagenes/Amiloidosis%20y/MM.5.w.jpg Cast nephropathy in myeloma - refractile crap (kidneypathology.com)].
*[http://www.kidneypathology.com/Imagenes/Amiloidosis%20y/MM.5.w.jpg Cast nephropathy in myeloma - refractile crap (kidneypathology.com)].
*[[WC]]:
<gallery>
**[http://commons.wikimedia.org/wiki/File:Cast_nephropathy_-_high_mag.jpg Myeloma cast nephropathy - high mag. (WC)].
Image:Cast_nephropathy_-_high_mag.jpg | Myeloma cast nephropathy - high mag. (WC/Nephron)
**[http://commons.wikimedia.org/wiki/File:Cast_nephropathy_-_2_cropped_-_very_high_mag.jpg Myeloma cast nephropathy - cropped - very high mag. (WC)].
Image:Cast_nephropathy_-_2_cropped_-_very_high_mag.jpg | Myeloma cast nephropathy - cropped - very high mag. (WC/Nephron)
 
</gallery>
====Stains====
====Stains====
*Myeloma casts = PAS -ve.
*Myeloma casts = PAS -ve.
Line 1,000: Line 1,075:
===Light chain deposition===
===Light chain deposition===
*Usually associated with kappa clone.
*Usually associated with kappa clone.
==Immunotactoid glomerulopathy==
===General===
*Uncommon.
*Thought to be a primary glomerulopathy.
**Must exclude [[lupus nephritis]], paraproteinemias, [[fibrillary glomerulopathy]], cryoglobulinemia, [[renal amyloidosis]].
*"Not universally" considered distinct from [[fibrillary glomerulopathy]].<ref name=pmid18045849>{{Cite journal  | last1 = Alpers | first1 = CE. | last2 = Kowalewska | first2 = J. | title = Fibrillary glomerulonephritis and immunotactoid glomerulopathy. | journal = J Am Soc Nephrol | volume = 19 | issue = 1 | pages = 34-7 | month = Jan | year = 2008 | doi = 10.1681/ASN.2007070757 | PMID = 18045849 | URL = http://jasn.asnjournals.org/content/19/1/34.full }}</ref>
Presentation:
*Nephrotic range proteinuria ~ 60% of cases.<ref name=pmid1996564>{{Cite journal  | last1 = Korbet | first1 = SM. | last2 = Schwartz | first2 = MM. | last3 = Lewis | first3 = EJ. | title = Immunotactoid glomerulopathy. | journal = Am J Kidney Dis | volume = 17 | issue = 3 | pages = 247-57 | month = Mar | year = 1991 | doi =  | PMID = 1996564 }}</ref>
*[[Hypertension]].
===Microscopic===
Features:
*Mesangial expansion.
DDx:
*Other causes of mesangial expansion.
===IHC===
*[[Congo red stain]] -ve.
==Fibrillary glomerulonephritis==
*[[AKA]] ''fibrillary glomerulopathy''.
===General===
*Rare ~ 1% native kidney biopsies.<ref name=pmid18045849>{{Cite journal  | last1 = Alpers | first1 = CE. | last2 = Kowalewska | first2 = J. | title = Fibrillary glomerulonephritis and immunotactoid glomerulopathy. | journal = J Am Soc Nephrol | volume = 19 | issue = 1 | pages = 34-7 | month = Jan | year = 2008 | doi = 10.1681/ASN.2007070757 | PMID = 18045849 | URL = http://jasn.asnjournals.org/content/19/1/34.full }}</ref>
*Presents as [[nephrotic syndrome]].
*Prognosis poor; large number progress to ESRD.
===Microscopic===
Features:
*Mesangial matrix expansion.
*Thickened capillary walls.
Images:
*www:
**[http://jasn.asnjournals.org/content/19/1/34/F1.expansion.html FG (asnjournals.org)].<ref name=pmid18045849/>
**[http://path.upmc.edu/cases/case78.html Fibrillary glomerulopathy (upmc.edu)].
===IF===
*IgG predominant.<ref name=pmid18045849/>
===Stains===
*[[Congo red stain]] -ve.
===EM===
*Fibrils:<ref name=pmid18045849/>
**Non-branching.
**Randomly arranged.
**Usu. 18-20 nm in diameter -- larger than amyloid (see below).
***Size range 12-24 nm.
Note:
*[[Amyloid]] between 8 and 15 nm (diameter), most often 8-12 nm.<ref name=pmid18045849>{{Cite journal  | last1 = Alpers | first1 = CE. | last2 = Kowalewska | first2 = J. | title = Fibrillary glomerulonephritis and immunotactoid glomerulopathy. | journal = J Am Soc Nephrol | volume = 19 | issue = 1 | pages = 34-7 | month = Jan | year = 2008 | doi = 10.1681/ASN.2007070757 | PMID = 18045849 | URL = http://jasn.asnjournals.org/content/19/1/34.full }}</ref>


==Aristolochic acid nephropathy==
==Aristolochic acid nephropathy==
Line 1,029: Line 1,158:
{{Main|Cystic kidney diseases}}
{{Main|Cystic kidney diseases}}
These are discussed in a separate article and include:
These are discussed in a separate article and include:
*Autosomal dominant polycystic kidney disease (ADPKD).
*[[Autosomal dominant polycystic kidney disease]] (ADPKD).
*Adult-onset medullary cystic disease.
*Adult-onset medullary cystic disease.
*Acquired renal cystic disease.
*[[Acquired renal cystic disease]].
*Autosomal recessive polycystic kidney disease (ARPKD).
*[[Autosomal recessive polycystic kidney disease]] (ARPKD).
*Medullary sponge kidney.
*Medullary sponge kidney.
*Nephronophthisis.
*Nephronophthisis.
*Cystic [[renal cell carcinoma]].
*Cystic [[renal cell carcinoma]].
=Pyelonephritis=
''Pyelonephritis'' is a misnomer; it is ''not'' an inflammatory process affecting the renal pelvis, as the name suggests. ''Pyelonephritis'' actually refers to a ''nephritis'' or ''tubulointerstitial nephritis''.<ref name=Ref_Sternberg5_1725>{{Ref Sternberg5|1725}}</ref>
It can be subdivided into:
*[[Acute pyelonephritis]].
*[[Chronic pyelonephritis]].
**[[Xanthogranulomatous pyelonephritis]].
==Acute pyelonephritis==
*[[AKA]] ''acute infectious tubulointerstitial nephritis''.
*[[AKA]] ''diffuse suppurative nephritis''.
===General===
*Typically preceeded by a (lower) [[urinary tract infection]] (UTI).
*Usually diagnosed clinically:
**Urine C&S, urine R&M, +/-CT abdomen.
**Fever, costovertebral tenderness.
===Gross===
Features:
*+/-[[Necrosis]] of renal papillae.<ref name=Ref_Klatt251>{{Ref Klatt|251}}</ref>
===Microscopic===
Features:
*[[Neutrophil]]s within the renal tubules and interstitium.<ref name=Ref_Sternberg5_1726>{{Ref Sternberg5|1726}}</ref>
====Images====
<gallery>
Image:Acute_pyelonephritis_-_intermed_mag.jpg | Acute pyelonephritis - intermed. mag. (WC/Nephron)
Image:Acute_pyelonephritis_-_2_-_high_mag.jpg | Acute pyelonephritis - high mag. (WC/Nephron)
Image:Acute_pyelonephritis_-_2_-_very_high_mag.jpg | Acute pyelonephritis - very high mag. (WC/Nephron)
</gallery>
==Chronic pyelonephritis==
*''Reflux nephropathy'' is considered synonym in some sources.<ref name=Ref_Sternberg5_1728>{{Ref Sternberg5|1728}}</ref>
===General===
*Inflammation of the kidney (''nephritis'') and renal pelvis (''pyelo-''<ref>URL: [http://medical-dictionary.thefreedictionary.com/pyelo- http://medical-dictionary.thefreedictionary.com/pyelo-]. Accessed on: 5 June 2015.</ref>).
*May be associated with vesicoureteral reflux.
*Chronic [[pyelonephritis]] may be a reason for nephrectomy.<ref>URL: [https://secure.health.utas.edu.au/intranet/cds/pathprac/Files/Cases/Renal/Case44/Case44.htm https://secure.health.utas.edu.au/intranet/cds/pathprac/Files/Cases/Renal/Case44/Case44.htm]. Accessed on: 26 July 2011.</ref>
===Gross===
*Dilated and distorted renal pelvis.<ref name=Ref_Sternberg5_1729>{{Ref Sternberg5|1729}}</ref>
*+/-[[Necrosis]] of renal papillae.<ref name=Ref_Klatt251>{{Ref Klatt|251}}</ref>
===Microscopic===
Features:<ref name=Ref_Sternberg5_1729>{{Ref Sternberg5|1729}}</ref>
*Mononuclear tubulointerstitial infiltrate.
**Usu. more dense at the pelvis.
*Interstitial fibrosis.
*+/-Renal casts (PAS positive); may result in a thyroid-like apparance.
DDx:
*[[End-stage kidney]].
*[[Myeloma cast nephropathy]].
===Stains===
*PAS +ve -- renal tubular casts.


=Disease that does not commonly get biopsied=
=Disease that does not commonly get biopsied=
==End-stage kidney==
{{Main|End-stage kidney}}
==Malignant hypertension==
==Malignant hypertension==
:''See: [[hyperplastic arteriolosclerosis]]''.
:''See: [[hyperplastic arteriolosclerosis]]''.
Line 1,043: Line 1,231:
*May be seen in [[scleroderma]].
*May be seen in [[scleroderma]].


==Pyelonephritis==
==Acute tubular necrosis==
*Often abbreviated ''ATN''.
===General===
===General===
*Usually diagnosed clinically: urine C&S, urine R&M, +/-CT abdomen.
Diagnosed clinically:
*May be associated with vesicoureteral reflux.
*Using urine R&M - hemegranular casts<ref name=pmid19921458>{{Cite journal  | last1 = Kanbay | first1 = M. | last2 = Kasapoglu | first2 = B. | last3 = Perazella | first3 = MA. | title = Acute tubular necrosis and pre-renal acute kidney injury: utility of urine microscopy in their evaluation- a systematic review. | journal = Int Urol Nephrol | volume = 42 | issue = 2 | pages = 425-33 | month = Jun | year = 2010 | doi = 10.1007/s11255-009-9673-3 | PMID = 19921458 }}</ref> are diagnostic.
*Chronic pyelonephritis may be a reason for nephrectomy.<ref>URL: [https://secure.health.utas.edu.au/intranet/cds/pathprac/Files/Cases/Renal/Case44/Case44.htm https://secure.health.utas.edu.au/intranet/cds/pathprac/Files/Cases/Renal/Case44/Case44.htm]. Accessed on: 26 July 2011.</ref>
*Anuria or low urine output.


===Gross===
===Gross===
Features:<ref name=Ref_Klatt251>{{Ref Klatt|251}}</ref>
*Poorly defined corticomedullary junction - soft finding.
*+/-[[Necrosis]] of renal papillae.
*Slightly heavier ~ 180 grams.<ref name=pmid19207286/>


===Microscopic===
===Microscopic===
Features:
Features:<ref name=pmid19207286>{{Cite journal  | last1 = Kocovski | first1 = L. | last2 = Duflou | first2 = J. | title = Can renal acute tubular necrosis be differentiated from autolysis at autopsy? | journal = J Forensic Sci | volume = 54 | issue = 2 | pages = 439-42 | month = Mar | year = 2009 | doi = 10.1111/j.1556-4029.2008.00956.x | PMID = 19207286 }}</ref>
*Interstitial nephritis.
*Tubular epithelial whorls - present in approx. one third of cases - '''most important'''.
**Detached epithelium within the luminal space surrounded by epithelium.
***Similar to ''epithelial telescoping'' seen in endometrial biopsies.
*Tubulorrhexis - present in approx. one third of cases.
**Disruption of the tubular basement membrane.
*Interstitial edema - sensitive... but not specific.


==Acute tubular necrosis==
Notes - not particularily useful findings:
*Often abbreviated ''ATN''.
*Mitoses.
===General===
*Casts in tubules.
*Best diagnosed clinically (using urine R&M) - hemegranular casts are diagnostic.


===Microscopic===
===IHC===
Features:<ref>PS. April 2009.</ref>
*Ki-67 - focal nuclear staining of the tubular epithelium.<ref name=pmid19207286/>
*Hemegranular casts in the lumen.
*Regenerative activity.
**Mitoses - '''diagnositic''' but uncommon.


==Hepatorenal syndrome==
==Hepatorenal syndrome==
Line 1,091: Line 1,281:
Features (kidney):
Features (kidney):
*Normal.
*Normal.
==Nephrocalcinosis==
===General===
*[[Hypercalcemia]].
===Microscopic===
Features:
*Calcification of the renal parenchyma - '''key feature'''.
Images:
*[http://path.upmc.edu/cases/case514.html Nephrocalcinosis (upmc.edu)].


=Renal transplant pathology=
=Renal transplant pathology=
Line 1,114: Line 1,315:
*[http://www.fondazionedamico.org/biopsiarenale_atlas/seco/crio/crio.htm Cryoglobulinemic nephritis (fondazionedamico.org)].
*[http://www.fondazionedamico.org/biopsiarenale_atlas/seco/crio/crio.htm Cryoglobulinemic nephritis (fondazionedamico.org)].


[[Category: Genitourinary pathology]]
[[Category: Medical kidney pathology]]

Latest revision as of 03:21, 22 February 2017

Micrograph showing a glomerulus with an acute thrombotic microangiopathy. PAS stain.

This article describes medical renal disease or the medical kidney. Much in medical kidney depends on the clinical information. Most of the disease seen by pathologists is... glomerular disease. It is one of the few areas that routinely requires electron microscopy.

Medical kidney is niche area in pathology. In the context of exams for general pathologists, if in doubt... the answer to most questions is diabetes mellitus or systemic lupus erythematosus.

Kidney tumours are dealt with in the kidney tumours article, and pediatric kidney tumours article.

Clinical

Creatinine

  • The standard screening test for renal function.
  • 300 mmol/L is the general cut-point for referral to a nephrologist.[1]

Notes:

  • In some parts of the world they use the units mg/dL; normal with these units is: 0.8 to 1.4 mg/dL.[2]
  • Conversion: 1.0 mg/dL = 88.4 umol/L.[3][4]

Glomerular filtration rate

  • Abbreviated GFR.
  • Ultimate measure of renal function - usually estimated from the serum creatinine using a formula.
  • Declines with age.
  • Normal range (dependent on age): 116-75 mL/min/1.73m2.[5]

Urine protein to creatinine ratio

  • Indicator of proteinuria.
  • Predictor of glomerular filtration rate.[6]

Cut points:[7]

  • Normal (2 years and older): <0.2 g protein / g Creatinine
  • Nephrotic range: >3.5 g protein / g Creatinine.

Complement

C3, C4 levels:[8]

ANCA

Types:[12]

C4d

  • Suggests humoral immunity (antibody-mediated immunity) at play.
  • Important in monitoring of renal transplant recipients.
  • Immunostain also available - see below.

Other blood work

Renal ultrasound

  • Normal adult kidney size ~10.8+/-0.8 cm.[13]
  • Good for assessing the major vessels, drainage system and parenchymal lesions.
    • Renal artery stenosis?
    • Hydronephrosis?
    • Pelviectasis?
    • Renal cyst?
    • Renal mass?

Urine dip

Findings:[14]

  • RBC casts = acute bleed, e.g. nephritic syndrome.
  • WBC casts = interstitial nephritis, e.g. pylonephritis, parenchymal infection.
  • Hemegranular casts = acute tubular necrosis, transplant rejection.

Notes:

  • "Active sediment" = RBCs, RBC casts;[15] implies glomerulonephritis.
    • Some include the above (RBCs, RBC casts) + WBCs & protein.[16]

Urine crystals

Main article: Crystals in body fluids

Clinical presentations

Nephrotic syndrome

Features:

  • Anasarca (whole body - edema).
  • Proteinuria (>3.5 g/24h).
  • Hypercholesterolemia.
  • Hypoalbuminemia.

Nephritic syndrome

Features - mnemonic PHAROH:[17]

  • Proteinuria.
  • Hypertension.
  • Azotemia.
  • RBC casts.
  • Oliguria.
  • Hematuria.

Mixed

Clinical DDx

Renal failure 101

  • Prerenal.
    • Shock - cardiogenic, hypovolemic, neurogenic, septic, anaphylatic.
  • Renal.
    • What this article deals with.
  • Postrenal.

Renal causes

  • Isolated hematuria.
  • Isolated proteinuria.
  • Nephrotic syndrome.
  • Nephritis syndrome.
  • Rapidly progressive glomerulonephritis.
  • Chronic renal failure.
  • A combination of any of the above.

The clinical presentations suggest a pathologic DDx.[18]

Isolated hematuria

Proteinuria

Nephritic syndrome

Classic:

Others:

Rapidly progressive glomerulonephritis

Classification:[20]

  1. Linear immune deposits.
  2. Granular immune deposits.
  3. Pauci-immune.

Nephrotic syndrome

Mixed presentation

Normal kidney

Cells of the glomerulus

  • Podocytes.
  • Mesangial cells.
  • Endothelium.

Epithelium

Features:[21]

  • The glomeruli visceral epithelium is part of the capillary wall (part of the glomerular tuft).
  • The parietal epithelium is part of Bowman's capsule.

Remember: visceral has vessels.

Glomerulus

  • A large autopsy series suggest it is: 223-292 micrometers.[22]
    • Another autopsy series suggests the mean diameter is: 225 micrometers.[23]

Note:

  • If the glomerulus fills half the field at 40x on a microscope with 22 mm diameter eye pieces it is ~ 0.275 mm or 275 micrometers.

Glomerular basement membrane

The glomerular basement membrane (GBM) should be thinner than the tubular basement membrane.

Images

  • Benign kidney - very low mag.

  • Benign kidney - low mag.

  • Benign kidney - low mag.

  • Benign kidney - intermed. mag.

Basic approach to renal biopsy

Basic components

  • Glomeruli.
  • Tubules.
  • Interstitium.
  • Vessels.

Memory device GI TV: glomeruli, interstitium, tubules, vessels.

Glomeruli

  1. Mesangium
    • Matrix should be: "one cell thick" (expanded in diabetes mellitus).
    • Cellularity of the mesangium - normal = upto 3 cells (don't count cell abutting the capillary lumen, don't count at the hilum).
  2. Capillary loops "open"
    • Lumina patent? If not patent is it due to matrix or cells (endocapillary hypercellularity).
    • Capillary wall morphology - wavy thin is normal; hulla-hoop/wire-like abnormal (suggestive of immune complex deposition).
  3. Bowman's space (urinary space) - crescents present?
  • Count the number of glomeruli.
  • Count number of the obsolete glomeruli.

Notes:

Components of the glomeruli (anatomical)

Obsolete glomeruli

  • Completely sclerosed glomeruli are not important - unless present in larger numbers than expected for the age of the patient.
Percent of sclerosed glomeruli = (age in years)/2 - 10%.[27]

Example:

  • It is normal for an 80 year-old to have 30% sclerosed glomeruli.

Glomerular disease terms

Number of glomeruli involved:[28]

  • Focal = some of the glomeruli.
    • In practical terms, defined as: <50% of glomeruli.
  • Diffuse = most of glomeruli.

How much of the glomerulus is involved:[28]

  • Global = most of the glomerulus.
    • In practical terms, defined as: >80% of glomerulus.[29]
  • Segmental = part of the glomerulus.

Vessels

  1. Arteriolar hyalinosis - too much glassy pink stuff?
  2. Intimal hyperplasia (atherosclerosis).

Consider:

Arteriolar hyalinosis

Microscopic:

  • Small vessels (afferent +/- efferent arteriole) with:
    • Glassy eosinophilic material in arteriolar wall.

DDx:

Note:

  • Arteriolar hyalinosis - involves afferent and efferent arterioles in diabetes, in others it is only the afferent.

Memory device ADHD:

  • Aging, Diabetes, Hypertension, Drugs.
Image

  • Arterial hyaline - HE - very high mag. (WC/Nephron)

  • Arterial hyaline - PAS - very high mag. (WC/Nephron)

  • Arterial hyaline - HPS - very high mag. (WC/Nephron)

Atherosclerosis

Main article: Atherosclerosis

Microscopic:

  • Intimal thickening of medium-sized vessels.
    • Where is the intima/media interface?
      • Internal elastic lamina - wavy band of eosinophilic material on H&E that is 1-2 micrometres thick.

Grading - based on the thickness of the media and intima:

  • Mild: (tunica) media > (tunica) intima.
  • Moderate: media = intima.
  • Severe: media < intima.

Tubules

Tubules - proximal portion is the most important.

Consider:

  • Casts?
  • Degeneration, i.e. apoptosis.
  • Necrosis?
  • Regeneration, e.g. mitoses.

Interstitium

Interstitium

  • Fibrosis - prognostically important.
    • Grading: mild = <25%, moderate 25-50%, severe >50%.
  • Inflammation?

Important terms/process related

Staining

The standard stain in kidney pathology is PAS. Section are usually 1-2 micrometers, as opposed to 4-5 micrometers seen in rountine section of other organs.

Interpretation of medical renal disease more difficult or even impossible if the sections are thicker, as one does not see the glomerular structures well.

In kidney that is cut thick the glomeruli look more nodular and it is more difficult to find open capillary loops.

Immunofluorescence

Routinue (mnemonic GAM CF):

  • IgG.
  • IgA.
  • IgM.
  • C1q
  • C3.
  • Fibrinogen.
  • Albumin.

Optional:

  • Kappa.
  • Lambda.
  • C4d.
    • Positive staining = peri-tubular capillaries stain.

Negative immunofluorescence

  • Excludes all immune complex associated disease.

Seen in:

Positive immunofluorescence

  • Positive immunofluorescence is usually diagnostic.

Basic patterns:

  1. Linear.
  2. Granular.
  3. Ring-like.

Examples:

Notes:

Immune complex-related disease

Can be:

Pathologic differential diagnosis

Tram-tracking of BM

DDx:[30]

  1. MPGN.
  2. Thrombotic microangiopathy (TMA).
  3. Transplant glomerulopathy (TG).

Mesangial hypercellularity

DDx:

  1. Lupus nephritis.
  2. IgA nephropathy.

Mesangial expansion

  • A patch of matrix can contain more than three mesangial cell nuclei.
    • Highly subjective.

DDx:

Glomerular crescents

General

  • Indicates a rapidly progressive disease.
  • Etiology/definition: break in the glomerular basement membrane (GBM).

Microscopic

Features:

  • Crescentic-shaped lesion in the urinary space of a glomerulus.
    • Crescent = looks like the moon shortly after new moon.
    • Cells & cellular debris in the urinary space.
      • Crescents lack GBM -- thus PAS -ve and MPAS -ve.
  • Break in the glomerular basement membrane - key feature.
  • Fibrin.
  • Inflammatory cells (lymphocytes, plasma cells, eosinophils, macrophages) - extravascular - low power feature.

DDx:

  • Glomerular sclerosis:
    • GBM visible through-out glomerulus.
    • No fibrin.
    • Collagen deposition within the glomerular tuft.
    • +/-Glomerular tuft-capsule adhesions.
    • +/-Glomerular enlargement.
    • Usu. no significant inflammation.

Bland necrotic crescents

DDx:

  • ANCA-related glomerulonephritis.
  • Anti-GBM disease.

Diseases with crescents - is a long list.[32]

Primary light microscopy patterns

Pattern Key feature Other findings DDx of the pattern DDx Image
Normal light microscopy Normal histology none or few glomeruli in a biopsy of an under sampled FSGS membranous nephropathy, focal segmental glomerulosclerosis (FSGS) normal kidney, minimal change disease, thin glomerular basement membrane disease, Alport syndrome, early membranous nephropathy
Benign kidney (WC)
Nodular mesangial expansion nodular mesangial matrix expansion, no mesangial hypercellularity GBM thickening, both afferent and efferent arteriole hyalinized diffuse proliferative GN, membranous nephropathy diabetic nephropathy, idiopathic nodular glomerulosclerosis, renal amyloidosis, light chain deposition disease, fibrillary glomerulopathy, immunotactoid glomerulopathy
Nodular GS (WC)
Membranous nephropathy (MN) GBM spikes or pinholes with silver stain, GBM thickening on PAS +/-mesangial hypercellularity +/-tram-tracking/wireloop GBM normal light microscopy, light chain deposition disease hepatitis B, hepatitis C, carcinoma, NSAID toxicity, SLE, idiopathic (MN); light chain deposition disease (plasma cell neoplasm)
MN (WC)
Focal segmental glomerulosclerosis sclerosed glomeruli = mesangial expansion with collagen +/-glomerular enlargement, +/- tuft-capsule adhesions rapidly progressive glomerulonephritis, nodular mesangial expansion primary FSGS, secondary FSGS (HIV, IVDU, obesity, parvovirus B19, Alport syndrome
FSGS (WC)
Diffuse proliferative glomerulonephritis mesangial hypercellularity +/-mesangial expansion, +/-interstitial inflammation nodular glomerulosclerosis post-infectious glomerulonephritis, MPGN, dense deposit disease, diffuse proliferative lupus nephritis (class IV), cryoglobulinemic GN
MPGN (WC)
Rapidly progressive glomerulonephritis glomerular crescents +/-inflammation, +/-vasculitis FSGS, diffuse proliferative glomerulonephritis AGBM, post-infectious glomerulonephritis, pauci-immune GN, immune complex diseases (lupus nephritis, IgA nephropathy, others)
Crescentic GN (WC)
Tubular injury tubular degeneration (loss of cilia in proximal tubule, apoptosis, necrosis), regeneration (mitosis, nucleoli) +/-interstitial fibrosis normal light microscopy acute tubular necrosis, chronic allograft nephropathy
CAN (WC)
Small vessel pathology luminal narrowing; +/-thrombosis, +/-hyalinosis +/-onion-skinning none thrombotic microangiopathy (malignant hypertension, scleroderma renal crisis, DIC, HUS, TTP,
Hyalinosis (WC)
TMA (WC)
Large vessel pathology luminal narrowing or obstruction; +/-intimal thickening; +/-embolization +/-medial thinning none atherosclerosis, cholesterol embolism, other types of embolism, thrombosis
Cholesterol embolus (WC)

Diagnoses - Table

Pattern Key feature Other findings IF & EM Presentation Clinical Pathol. DDx Image
Nodular glomerulosclerosis nodular mesangial matrix expansion GBM thickening, both afferent and efferent arteriole hyalinized EM? proteinuria - typical presentation, nephrotic syndrome[citation needed] diabetes mellitus (DM) amyloidosis, idiopathic nodular glomerulosclerosis (nodular GS without DM)
Nodular GS (WC)
Focal segmental glomerulosclerosis (FSGS) focal sclerosis of gloms +/-interstitial fibrosis IF: negative; EM: foot process loss nephrotic syndrome primary FSGS, secondary FSGS (HIV, IVDU, obesity, parvovirus B19, Alport syndrome); unresponsive to steroids, worse prognosis than MCD minimal change disease
FSGS (WC)
Membranous nephropathy
(AKA membranous GN) 		spikes or pinholes with silver stain mesangial hypercellularity; +/-tram-tracking/wireloop GBM IF: diffuse granular capillary loop IgG, C3, kappa, lambda; EM: diffuse subepithelial deposits - spike forming nephrotic syndrome hepatitis B, hepatitis C, carcinoma, NSAID toxicity, SLE, idiopathic Nodular glomerulosclerosis (?)
MN (WC)
Minimal change disease (MCD) foot process loss on EM usu. none EM: foot process loss nephrotic syndrome primary vs. secondary (lymphoproliferative disorder, NSAIDs); idiopathic responds to steroids FSGS, thin glomerular basement membrane disease (histologic DDx) Image?
IgA nephropathy IgA branching pattern +/-mesangial hypercellularity, +/-crescents IF: IgA +ve (branching pattern); EM: dense mesangial deposits mixed nephrotic/nephritic primary vs. secondary (Henoch-Schoenlein purpura) RPGN
HSN - IgA IHC (WC)
Membranoproliferative glomerulonephritis (MPGN) thick GBM Other findings? subepithelial deposits mixed nephrotic/nephritic SLE, cryoglobulinemia, hepatitis B, hepatitis C Pathol. DDx?
MPGN (WC)
Focal proliferative
glomerosclerosis (FPGS) 		<50% of glomeruli partially sclerosis Other findings? EM? mixed nephrotic/nephritic Clinical? Pathol. DDx? Image?
Rapidly progressive GN (RPGN) crescents Other findings? EM? nephritic syndrome AGBM, ANCA-vasculitis IgA nephropathy with crescents Image?
Dense deposit disease IF: linear C3 with rings +/-thick GBM EM: GBM lamina densa thickening Presentation? mixed nephrotic/nephritic (???) MPGN (nature.com)

Diffuse proliferative glomerulonephritis

Pattern Key feature Clinical
Post-infectious glomerulonephritis IF: capillary loop +/- mesangial IgG/C3; EM: large infreq. hump-like subepithelial deposits post-infection
Membranoproliferative glomerulonephritis (MPGN) mesangial proliferation with thickening of the glomerular capillary loops[33] low C3, normal C4; primary vs. secondary (often hepatitis C)
Dense deposit disease IF: linear C3 with rings
Cryoglobulinemic glomerulonephritis
Diffuse proliferative lupus glomerulonephritis systemic lupus erythematosus; low C3, low C4
Diffuse proliferative IgA nephropathy IF: IgA +ve (branching pattern)

Common diseases

Diabetic nephropathy

General

Microscopic

Features:[34]

  • Thick glomerular basement membrane (GBM).
  • Thickened (eosinophilic) tunica media in both the afferent and efferent arterioles.[35]
  • Mesangial matrix expansion - leads to nodule formation Kimmelstiel-Wilson nodules (nodular glomerulosclerosis).

Others:

  • Armanni-Ebstein change = cytoplasmic vacuolization of tubular cells (usu. loop of Henle) -- innermost cortex, outer medulla;[36] not specific to diabetes mellitus.[37]
  • Capsular drop = hyaline material deposited in the Bowman's capsule.[38]
  • Fibrin cap = subendothelial deposition of hyaline material.[38]

Other - with weak evidence:

  • Extra efferent vessels.[39]

Memory device:

  • GBM = thick GBM, both afferent & efferent arterioles thickened, mesangial matrix expansion.

Images

  • Diabetic glomerulosclerosis. (WC/KGH)

  • Diabetic glomerulosclerosis. (WC/KGH)

  • Diabetic glomerulosclerosis. (WC/KGH)

  • Nodular glomerulosclerosis. (WC)

www:

Notes:

  • Hypertensive kidneys have changes only in the afferent arteriole, i.e. the efferent arteriole is spared (see hypertension).

Grading

The severity of changes can be indicated by the grade:[40]

Grade Criteria
Grade I GBM thickening on EM only
Grade II Mild-to-moderate mesangial expansion only on LM
Grade III Glomerulus with mesangial nodules (Kimmelstiel–Wilson nodules)
Grade IV Stage III + global sclerosis in >50% of glomeruli

IF

  • Negative.
  • +/-Nonspecific linear IgG.

EM

  • Severe thickening of GBM.
  • Mesangial sclerosis.

Lupus nephritis

  • Abbreviated LN.

General

Main article: Systemic lupus erythematosus
  • Bread & butter of nephropathology.
  • The biopsy is done to determine treatment, i.e. how much immunosuppression is needed.

Immunofluorescence

  • "Full house" = all of 'em light up.

Classification

International Society of Nephrology/Renal Pathology Society (ISN/RPS) classification:[41][42]

  • Class I - minimal mesangial LN.
  • Class II - mesangial proliferative LN.
    • Mesangial hypercellularity. (???)
  • Class III - focal lupus nephritis; <50% of glomeruli.
    • Mesangial hypercellularity. (???)
  • Class VI-S - diffuse segmental LN; >50% of glomeruli.
    • Mesangial hypercellularity. (???)
  • Class VI-G - global LN; >50% of glomeruli.
  • Class V - Membranous lupus nephritis.
  • Class IV - Advanced sclerosing LN; essentially end-stage kidney.

Notes:

  • Most of the action is in Class III and Class IV.
    • Class I is near normal - doesn't get biopsied.
    • Class IV is essentially a dead kidney - doesn't get biopsied.

Images

  • SLE nephritis - schematic. (WC)

Nephrotic syndrome

Main article: Nephrotic syndrome

This classically includes the following:

It also includes:

Mixed nephrotic and nephritic

IgA nephropathy

General

Microscopic

Features:

  • Variable:
    • Mesangial hypercellularity - may be only light microscopy finding.

Note:

  • Diagnosis based on immunofluorescence (IgA+).

Images

  • HSP - IgA IHC (WC)

Scoring

IgA nephropathy can be scored using an assessment of mesangial proliferation, endocapillary proliferation, glomerulosclerosis and tubular atrophy and interstitial fibrosis (abbreviated MEST).[47]

IF

  • IgA +ve in a branching pattern - diagnostic.

EM

  • Mesangial deposits.
    • These are electron dense, ergo dark on EM images.

Membranoproliferative glomerulonephritis

  • Abbreviated MPGN.
  • Old name MPGN type 1.

General

Clinical:

  • Nephrotic syndrome or nephrotic/nephritic syndrome.

Pathology:

  • May be primary, i.e. idiopathic, or secondary, i.e. a consequence of another pathologic process.[33]

Secondary causes

Other causes:

Microscopic

Features:

  • Endothelial cell proliferation.
  • Basement membrane double layering (tram-tracking).
  • Mesangial hypercellularity.

DDx:

Images

  • MPGN - intermed. mag. (WC/Nephron)

  • MPGN - very high mag. (WC/Nephron)

EM

Features:

  • Subendothelial immune deposits - classic finding.[49]
  • Subepithelial immune deposits - historically considered uncommon.[50]

Dense deposit disease

  • Abbreviated DDD.
  • AKA MPGN type 2 (old name).

General

  • Usually children and young adults.
  • No longer considered a type of MPGN.[51]

Microscopic

Features:

  • Variable - may be like MPGN.
    • Four patterns:[51]
      1. Hypercellularity and lobular (membranoproliferative-like).
      2. Mesangial proliferative.
      3. Crescentic.
      4. Acute proliferative and exudative.

Images:

IF

  • Linear C3 with mesangial rings (donut-like).
  • IgG negative.
  • IgA negative

Images:

EM

  • Electron dense transformation of GBM lamina densa - key feature.
    • Dense = darker.

Images:

Nephritic syndrome

Rapidly progressive glomerulonephritis

  • Abbreviated RPGN.
  • AKA crescentic glomerulonephritis.

General

  • Acute renal dysfunction.
  • Nephritic syndrome.

DDx:

  1. Linear immunofluorescence.
  2. Granular immunofluorescence
  3. Pauci-immune.

Microscopic

Features:

Images

  • RPGN (WC/KGH)

  • RPGN (WC/KGH)

  • RPGN - intermed. mag. (WC/Nephron)

  • RPGN - high mag. (WC/Nephron)

Post-infectious glomerulonephritis

  • Abbreviated PIGN.
Main article: Post-infectious glomerulonephritis

Rare diseases

Antiglomerular basement membrane disease

  • Abbreviated AGBM.

General

  • Known as Goodpasture disease (AKA Goodpasture syndrome), if renal failure is accompanied by pulmonary hemorrhage.[52]
  • Rare - estimated incidence 1/1-2 million.[53]
  • Antibody mediated hypersensitivity.
  • Thought to occur in genetically susceptible individuals.[53]
    • Associated with a specific HLA type (HLA-DRB1*1501) and two gene families.
    • Antibodies directed against COL4A3,[54] which is not mutated.
  • Oligouria - poor prognosticator.[citation needed]

Tx:

  • Immune suppression & plasma exchange.[55]

Clinical DDx:

Microscopic

Features:

  • RPGN.
    • Crescentic glomerulonephritis.

Images

  • RPGN - intermed. mag. (WC/Nephron)

  • RPGN - high mag. (WC/Nephron)

www:

IF

  • Linear IgG deposits - diagnostic.
  • Fibrinogen in crescents.

DDx:

  • Goodpasture syndrome with the pulmonary hemorrhage.

Image:

Thin glomerular basement membrane disease

General

Clinical:

  • Hematuria.
  • FHx.
  • Nonprogressive.

Microscopic

  • Normal.

IF

  • Normal.

EM

  • GBM thin <200-250 - key feature.

Note:

  • Normal GBM: 300-350 nm.

Alport syndrome

General

Clinical:

  • Hearing loss (sensorineural).
  • Hematuria - usually preceeds hearing loss.[57]

Etiology:

  • Genetic defect - collagen type IV.

Inheritance:[57]

  • X-linked - 80%.
  • Autosomal recessive - 15%.
  • Autosomal dominant - 5%.

Microscopic

Features:[59]

  • Usu. normal.
  • +/-Foamy appearing renal tubular cells.[60]

IF

  • Negative.

EM

Features:[59]

  • Abnormal glomerular basement membrane (GBM); thinning or thickening.
    • Classically thinning with thick lamellation (splitting/multi-layering).

Idiopathic nodular glomerulosclerosis

General

Associations:[61]

Microscopic

Features:[61]

  • Looks like diabetic nodular glomerulosclerosis.

IF

Nonspecific.

EM

Nonspecific.

Fabry disease

Main article: Fabry disease

Myeloma

See: Haematopathology.
  • AKA myeloma kidney.

Myeloma cast nephropathy

General

  • Renal failure.

Microscopic

Features:[63]

  • Crap in tubules, eosinophilic.
    • Classically angulated.
    • Refractile.
  • Cast with cellular reaction - virtually diagnostic.
    • Macrophages (CD68 +ve).
Images

www:

  • Myeloma cast nephropathy - high mag. (WC/Nephron)

  • Myeloma cast nephropathy - cropped - very high mag. (WC/Nephron)

Stains

  • Myeloma casts = PAS -ve.
    • Hyaline casts = PAS +ve.

Amyloidosis

Main article: Amyloidosis
  • Usually associated with lambda clone.

Light chain deposition

  • Usually associated with kappa clone.

Immunotactoid glomerulopathy

General

Presentation:

Microscopic

Features:

  • Mesangial expansion.

DDx:

  • Other causes of mesangial expansion.

IHC

Fibrillary glomerulonephritis

  • AKA fibrillary glomerulopathy.

General

  • Rare ~ 1% native kidney biopsies.[64]
  • Presents as nephrotic syndrome.
  • Prognosis poor; large number progress to ESRD.

Microscopic

Features:

  • Mesangial matrix expansion.
  • Thickened capillary walls.

Images:

IF

  • IgG predominant.[64]

Stains

EM

  • Fibrils:[64]
    • Non-branching.
    • Randomly arranged.
    • Usu. 18-20 nm in diameter -- larger than amyloid (see below).
      • Size range 12-24 nm.

Note:

  • Amyloid between 8 and 15 nm (diameter), most often 8-12 nm.[64]

Aristolochic acid nephropathy

General

  • Nephropathy due to chinese herbs for slimming.[68]
  • Associated with urothelial atypia/urothelial carcinoma.

Clinical:

  • Chinese herb use.
  • Low-molecular weight proteinuria.

Microscopic

Features:[68]

  • Extensive interstitial fibrosis.
  • Tubular atrophy - typically greater in outer cortex than inner cortex.
  • Glomeruli spared.
  • +/-Nuclear atypia of the urothelium.

DDx:

  • Balkan endemic nephropathy.

Image:

Cystic kidney diseases

Main article: Cystic kidney diseases

These are discussed in a separate article and include:

Pyelonephritis

Pyelonephritis is a misnomer; it is not an inflammatory process affecting the renal pelvis, as the name suggests. Pyelonephritis actually refers to a nephritis or tubulointerstitial nephritis.[69]

It can be subdivided into:

Acute pyelonephritis

  • AKA acute infectious tubulointerstitial nephritis.
  • AKA diffuse suppurative nephritis.

General

  • Typically preceeded by a (lower) urinary tract infection (UTI).
  • Usually diagnosed clinically:
    • Urine C&S, urine R&M, +/-CT abdomen.
    • Fever, costovertebral tenderness.

Gross

Features:

Microscopic

Features:

Images

  • Acute pyelonephritis - intermed. mag. (WC/Nephron)

  • Acute pyelonephritis - high mag. (WC/Nephron)

  • Acute pyelonephritis - very high mag. (WC/Nephron)

Chronic pyelonephritis

  • Reflux nephropathy is considered synonym in some sources.[72]

General

  • Inflammation of the kidney (nephritis) and renal pelvis (pyelo-[73]).
  • May be associated with vesicoureteral reflux.
  • Chronic pyelonephritis may be a reason for nephrectomy.[74]

Gross

Microscopic

Features:[75]

  • Mononuclear tubulointerstitial infiltrate.
    • Usu. more dense at the pelvis.
  • Interstitial fibrosis.
  • +/-Renal casts (PAS positive); may result in a thyroid-like apparance.

DDx:

Stains

  • PAS +ve -- renal tubular casts.

Disease that does not commonly get biopsied

End-stage kidney

Main article: End-stage kidney

Malignant hypertension

See: hyperplastic arteriolosclerosis.
See: thrombotic microangiopathy.

Acute tubular necrosis

  • Often abbreviated ATN.

General

Diagnosed clinically:

  • Using urine R&M - hemegranular casts[76] are diagnostic.
  • Anuria or low urine output.

Gross

  • Poorly defined corticomedullary junction - soft finding.
  • Slightly heavier ~ 180 grams.[77]

Microscopic

Features:[77]

  • Tubular epithelial whorls - present in approx. one third of cases - most important.
    • Detached epithelium within the luminal space surrounded by epithelium.
      • Similar to epithelial telescoping seen in endometrial biopsies.
  • Tubulorrhexis - present in approx. one third of cases.
    • Disruption of the tubular basement membrane.
  • Interstitial edema - sensitive... but not specific.

Notes - not particularily useful findings:

  • Mitoses.
  • Casts in tubules.

IHC

  • Ki-67 - focal nuclear staining of the tubular epithelium.[77]

Hepatorenal syndrome

General

  • Acute renal failure secondary to liver failure (e.g. fulminant liver failure, cirrhosis with marginal liver function).

Clinical:

  • Urine sodium is low,[78] unlike in ATN (the main DDx).

Pathophysiology:

  • Renal vasoconstriction.[79]

Treatment: Medical and surgical:[80]

  • Vasoconstrictors (e.g. midodrine, terlipressin (counteracts splanchnic vasodilation), norepinephrine).
  • Albumin.
  • TIPS (transjugular intrahepatic portosystemic shunt).
  • Liver transplantation.

Note:

  • I suspect a portal vein pump would work... it reduces portal pressure and would likely increase hepatic function.

Microscopic

Features (kidney):

  • Normal.

Nephrocalcinosis

General

Microscopic

Features:

  • Calcification of the renal parenchyma - key feature.

Images:

Renal transplant pathology

Main article: Renal transplant pathology

See also

References

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  27. ↑ Fogo, Agnes B.; Kashgarian, Michael (2005). Diagnostic Atlas of Renal Pathology: A Companion to Brenner and Rector's The Kidney 7E (1st ed.). Saunders. pp. 16. ISBN 978-1416028710.
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  35. ↑ Østerby R, Hartmann A, Bangstad HJ (April 2002). "Structural changes in renal arterioles in Type I diabetic patients". Diabetologia 45 (4): 542–9. doi:10.1007/s00125-002-0780-2. PMID 12032631.
  36. ↑ Ritchie S, Waugh D (1957). "The pathology of Armanni-Ebstein diabetic nephropathy". Am. J. Pathol. 33 (6): 1035–57. PMC 1934668. PMID 13478656. http://www.ncbi.nlm.nih.gov/pmc/articles/PMC1934668/?page=1.
  37. ↑ Zhou C, Byard RW (September 2010). "Armanni-Ebstein phenomenon and hypothermia". Forensic Sci Int. doi:10.1016/j.forsciint.2010.08.018. PMID 20875709.
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