Trichoepithelioma in a systematized epidermal nevus with acantholytic dyskeratosis. Its occurrence in a black man

A 2-cm nodular neoplasm in the left parietal region developed in a 52-year-old black man with a 20-year history of a systematized epidermal nevus of the scalp. On biopsy, the epidermal nevus showed both "church spire" papillary changes and multiple foci of acantholytic dyskeratosis. The neoplasm showed quite distinct histopathologic patterns of trichoepithelioma.