Acquired dermal smooth-muscle hamartoma.
We report a patient with a hyperpigmented, non-hairy plaque on the forearm. The presence of disorganized smooth-muscle bundles within the dermis proved this lesion to be a dermal smooth-muscle hamartoma. The relationship of this lesion to the pigmented hairy nevus of Becker is discussed.
D000328:Adult; D001706:Biopsy; D005542:Forearm; D006222:Hamartoma / Q000473:pathology*; D006801:Humans; D008297:Male; D009130:Muscle, Smooth / Q000473:pathology*; D009508:Nevus, Pigmented / Q000473:pathology; D012867:Skin / Q000473:pathology*; D012878:Skin Neoplasms / Q000473:pathology*