Pilar Sheath Acanthoma

Pilar Sheath Acanthoma

David Cassarino, MD, PhD

Scanning magnification of a pilar sheath acanthoma shows a dilated follicular structure lined by a thickened squamous epithelium with endophytic, lobulated areas image.

Higher magnification of the lobular areas shows acanthotic squamous epithelium with peripheral palisading image and scattered clear-staining cells image.



  • Pilar sheath acanthoma (PSA)


  • Mature adnexal proliferation composed of thickened epithelium with enlarged pale-staining keratinocytes



  • No known causes/associations

Jul 8, 2016 | Posted by in PATHOLOGY & LABORATORY MEDICINE | Comments Off on Pilar Sheath Acanthoma

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