title: [A case of precancerous hair follicle tumor on the large pudendal lip].
abstract: A case of precancerous hair follicle tumor of a 60-year-old woman is reported. The tumor was detected in the large pudendal lip of an ATL-suspected patient. Microscopic findings showed that the tumor was a hair follicle tumor of low malignancy, such as a "malignant trichilemmoma", or "follicular Bowen's disease". Histogenesis and pathogenesis of this tumor are discussed including the relationships to ATL and "Trichilemmal horn".
mesh_terms: D001913:Bowen's Disease / Q000473:pathology*; D002294:Carcinoma, Squamous Cell / Q000473:pathology*; D005260:Female; D006801:Humans; D008875:Middle Aged; D011230:Precancerous Conditions / Q000473:pathology*; D012878:Skin Neoplasms / Q000473:pathology*; D014846:Vulvar Neoplasms / Q000473:pathology*