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squamoid adnexal tumors

Saturday 7 November 2020

PO

Types

- eosinophilic cells
- clear cells
- squamous cells with central keratinization

- (a) Solid lobules of eosinophilic cells :

  • pilar sheath acanthoma (connected to crater-like cavity)
  • acrospiroma (not connected to crater-like cavity)

- (b) Lobules with clear cells :

  • acrospiroma (luminal differentiation)
  • trichilemmoma (epidermal connection, peripheral palisading, thick basement membrane)
  • sebaceous tumors

- (c) Lobules of squamous cells with central keratinization

  • proliferative trichilemmal tumor

References

- from Sternberg: Diagnostic Surgical Pathology, 5th Edition, 2009 http://www.pathologyoutlines.com/topic/skintumornonmelanocyticadnexaltumorsgeneral.html