title: [The infundibular adenoma: a follicular poroma with sebaceous and apocrine differentiation (author's transl)].
abstract: Tricholemmal adnexal pilar tumors may be classified according to the tricholemmal zone whose structure they reproduce and according to their degree of maturation or dedifferentiation. The pilar sheath acanthoma (dilated pore of Winer), the tumor of follicular infundibulum and the follicular poroma (inverted follicular keratosis) are related to the infundibulum and keratinize according to the epidermal pattern. The tricholemmal cysts (of simple or proliferating type) and the keratinizing tricholemmoma are related to the upper part of the isthmus of the anagen hair and keratinize according to the specific pattern of the outer root sheath at this isthmic level. The tricholemmoma is related to the lower tricholemma which does not keratinize and the cells of which are glycogen-rich. In this vertical didactic classification, there exist combinations and filiations of the different tumors. In a serial analysis of 68 skin adnexal tumors diagnosed as follicular poromas, we observed 6 cases with sebaceous and apocrine differentiation. For this organoid tumor issued from the infundibular epithelium we propose the term of "infundibular adenoma".
mesh_terms: D000236:Adenoma / Q000145:classification / Q000473:pathology*; D001050:Apocrine Glands / Q000473:pathology*; D002471:Cell Transformation, Neoplastic; D006801:Humans; D012627:Sebaceous Glands / Q000473:pathology*; D012878:Skin Neoplasms / Q000473:pathology*; D013545:Sweat Glands / Q000473:pathology*
vernacular_title: L'adénome infundibulaire: un porome folliculaire à différenciation sébacée et apocrine.