View source for Benign cortical cyst of the kidney

{{ Infobox diagnosis
| Name       = {{PAGENAME}}
| Image      = Renal cyst with papillary projections -- low mag.jpg
| Width      =
| Caption    = Benign cortical renal cyst with papillary projections. [[H&E stain]].
| Synonyms   =
| Micro      = simple epithelial lining without atypia, may have clear cells
| Subtypes   =
| LMDDx      = [[localized cystic disease of the kidney]], cystic neoplasms/renal cell carcinoma (e.g. cystic [[clear cell renal cell carcinoma]]), [[multicystic renal cell neoplasm of low malignant potential]], other [[cystic kidney disease]]s
| Stains     =
| IHC        =
| EM         =
| Molecular  =
| IF         =
| Gross      = thin-walled cyst in the renal cortex, usually filled with serous fluid, usually unilocular
| Grossing   =
| Staging    =
| Site       = [[kidney]] - see ''[[cystic kidney diseases]]''
| Assdx      =
| Syndromes  =
| Clinicalhx =
| Signs      =
| Symptoms   =
| Prevalence = very common
| Bloodwork  =
| Rads       = simple cyst with thin wall; usually Bosniak I or II - see ''[[Bosniak classification of renal cysts]]''
| Endoscopy  =
| Prognosis  = benign
| Other      =
| ClinDDx    =
| Tx         = none
}}
'''Benign cortical cyst of the kidney''' is an extremely common benign [[kidney]] finding.

''Benign renal cyst'' redirects here. A more general discussion about cysts in the kidney is in the article ''[[cystic kidney diseases]]''.

==General==
*Very common.
*Benign.

==Gross==
*Thin-walled cyst - usually filled with serous fluid.
*Usually unilocular.

==Microscopic==
Features:
*Simple epithelial lining without atypia.
*May have clear cells.

Note:
*Do ''not'' have clear cells within the wall of the cyst.<ref>{{Ref DDxSPGU|197}}</ref>

DDx:
*[[Localized cystic disease of the kidney]].
*Cystic neoplasms/renal cell carcinoma:
**Cystic [[clear cell renal cell carcinoma]] - thick septa with clear cells.
**[[Multicystic renal cell neoplasm of low malignant potential]] - thin septa, clear cells within stroma.
*Other [[cystic kidney disease]]s.

===Images===
<gallery>
Image: Renal cyst with papillary projections -- very low mag.jpg | ARC - very low mag. (WC)
Image: Renal cyst with papillary projections -- low mag.jpg | ARC - low mag. (WC)
Image: Renal cyst with papillary projections -- intermed mag.jpg | ARC - intermed. mag. (WC)
Image: Renal cyst with papillary projections - alt -- intermed mag.jpg | ARC - intermed. mag. (WC)
Image: Renal cyst with papillary projections -- high mag.jpg | ARC - high mag. (WC)
Image: Renal cyst with papillary projections -- very high mag.jpg | ARC - very high mag. (WC)

Image: Renal cyst with papillary projections - 2 -- low mag.jpg | ARC - low mag. (WC)
Image: Renal cyst with papillary projections - 2 -- intermed mag.jpg | ARC - intermed. mag. (WC)
Image: Renal cyst with papillary projections - 2 -- high mag.jpg | ARC - high mag. (WC)
</gallery>

==See also==
*[[Cystic kidney diseases]].
*[[Bosniak classification of renal cysts]].
*[[Benign clear cell clusters of the kidney]].

==References==
{{Reflist|1}}

[[Category:Genitourinary pathology]]
[[Category:Diagnosis]]