title: [Pilar sheath acanthoma].
abstract: Pilar sheath acanthoma is a rare, benign follicular hamartoma. A case is reported, and the histological and clinical features of this skin tumor are described. The tumor is elevated and characterized by a central punched-out area filled with amorphous whitish material. In contrast to the keratoacanthoma, which has a similar clinical appearance, pilar sheath acanthoma shows no spontaneous regression.
mesh_terms: D000328:Adult; D004848:Epithelium / Q000473:pathology; D006197:Hair / Q000473:pathology*; D006801:Humans; D008297:Male; D009669:Nose Neoplasms / Q000473:pathology*; D010212:Papilloma / Q000473:pathology*; D012867:Skin / Q000473:pathology; D012878:Skin Neoplasms / Q000473:pathology*
vernacular_title: Haarscheidenakanthom.