(A) Intraepidermal poroma (hidroacanthoma simplex) consists of well-demarcated collections of poroid cells within the epidermis (H&E 40x). (B) Hidroacanthoma simplex resemble seborrheic keratosis histopathologically, but are distinguished by the presence of ducts within the neoplasm (H&E 200x).
Courtesy of Jeffrey P North, MD.
Graphic 98227 Version 2.0
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