[Nevus of the arrector muscle of the hair].
An eighteen year-old-male patient had an asymptomatic nevoid lesion with small papules over the right lumbosacral region. The nevus was diagnosed histologically as a nevus musculi arrector pili, the origin of which is seen in a nevoid hyperplasia of the smooth muscle bundles (mm. arrector pili) connected with hair follicles.
D000293:Adolescent; D001706:Biopsy; D006801:Humans; D008161:Lumbosacral Region; D008297:Male; D009130:Muscle, Smooth / Q000473:pathology*; D009506:Nevus / Q000473:pathology*; D012878:Skin Neoplasms / Q000473:pathology*
Naevus musculi arrector pili.