Vulvar hidradenoma papilliferum (HP) is located on the sites of mammary-like anogenital glands (MLAGs): Analysis of the photographs of 52 tumors

Vulvar HP is mainly located on mammary-like anogenital gland sites, thereby providing further evidence to their histogenesis. Although a nonulcerated or ulcerated tumor of the interlabial sulcus should evoke a HP diagnosis, the latter must be confirmed histologically.