Hidradenoma papilliferum of the vulva: case report and review of literature.

Hidradenoma papilliferum (HP) is a rare, small, benign, cystic, papillary, slow growing tumor occurring in anogenital region of adult women. The authors describe a case of large, rapidly enlarging HP of vulva in a 25-year-old woman and review the literature available on this rare condition.