(A) Trichoblastomas have large islands of basaloid keratinocytes with an associated hypercellular, fibrotic stroma (H&E 40x). (B) Peripheral palisading of the outermost keratinocytes is present, and dense collections of mesenchymal cells directly adjacent to the basaloid keratinocytes (papillary mesenchymal body) are identifiable (arrowhead) (H&E 200x).
Courtesy of Jeffrey P North, MD.
Graphic 98291 Version 2.0
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