| pilar sheath acanthoma |
a benign tumor of the hair follicle, usually occurring as an asymptomatic lesion on the upper lip of middle-aged adults; it is characterized by a central keratin-filled cavity lined by stratified squamous epithelium projecting into the connective stroma.
출처: www.mercksource.com/pp/us/cns/cns_hl_dorlands.jspz...
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