Intranodal palisaded myofibroblastoma

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Intranodal palisaded myofibroblastoma, abbreviated IPM, is a rare tumour that classically presents as an inguinal mass.[1]

General

  • Rare.
  • Male:female = 2:1.
  • Adults - middle age.

Microscopic

Features:

  1. Rim of peripheral lymphoid tissue.
  2. Spindle cells with nuclear palisading - key feature.
  3. RBC extravasation/hemorrhage.
  4. Amianthoid fibers - blood vessel surrounded by collagen with peripheral spokes.[2]
  5. Intracellular and extracellular fuchsinophilic bodies.
    • Smooth muscle actin.

DDx:

Images:

IHC

  • SMA +ve.
  • Cyclin D1 +ve.

Other:

  • S100 -ve
  • GFAP -ve.
  • CD34 -ve.
  • Desmin -ve
  • Ki-67 - low.

See also

References

  1. ↑ Nguyen, T.; Eltorky, MA. (Feb 2007). "Intranodal palisaded myofibroblastoma.". Arch Pathol Lab Med 131 (2): 306-10. doi:10.1043/1543-2165(2007)131[306:IPM]2.0.CO;2. PMID 17284119.
  2. ↑ 2.0 2.1 Bigotti, G.; Coli, A.; Mottolese, M.; Di Filippo, F. (Sep 1991). "Selective location of palisaded myofibroblastoma with amianthoid fibres.". J Clin Pathol 44 (9): 761-4. PMID 1918406.
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