title: Nevus unius lateralis exhibiting intraepidermal basaloid cell formation simulating superficial basal cell epithelioma.
abstract: A unilateral verrucous lesion with clinical characteristics of nevus unius lateralis (NUL) in an 18-year-old boy, showed histopathological features of intraepidermal basaloid cell formation simulating superficial basal cell epitheliomas. Biological significance of this phenomenon is discussed. The lesion is considered a most peculiar variant of NUL.
mesh_terms: D000293:Adolescent; D002280:Basal Cell Carcinoma / Q000175:diagnosis* / Q000473:pathology; D003937:Diagnosis, Differential; D004817:Epidermis / Q000473:pathology; D006801:Humans; D006965:Hyperplasia; D008297:Male; D012871:Skin Diseases / Q000175:diagnosis* / Q000473:pathology