title: [Smooth muscle hamartoma or nevus of Becker? Apropos of 4 cases].
abstract: Theoretically, Becker's melanosis or hairy epidermal nevus and smooth muscle hamartoma are two quite separate entities. In fact, there are cases which could be considered as intermediate. As a matter of fact, a slight underlying smooth muscle hyperplasia can be seen in Becker's nevus; on the other hand, hypermelanosis of the basal layer and hypertrichosis may be encountered in smooth muscle hamartoma. The 4 here reported cases are examples of diagnostic difficulties for which the sometimes not clear-cut limits of these 2 types of lesion can be responsible.
mesh_terms: D000328:Adult; D002675:Child, Preschool; D003937:Diagnosis, Differential; D005260:Female; D006222:Hamartoma / Q000151:congenital / Q000175:diagnosis* / Q000473:pathology; D006801:Humans; D006965:Hyperplasia; D006983:Hypertrichosis / Q000175:diagnosis; D007223:Infant; D008297:Male; D009130:Muscle, Smooth / Q000473:pathology*; D009508:Nevus, Pigmented / Q000151:congenital / Q000175:diagnosis* / Q000473:pathology; D012878:Skin Neoplasms / Q000151:congenital / Q000175:diagnosis* / Q000473:pathology; D012880:Skin Pigmentation
vernacular_title: Hamartoma muscular liso o nevo de Becker? A propósito de cuatro casos.