Multiple primary neoplasms of the anogenital region.

The anogenital region, comprising the cervix, vagina, vulva, perineum, and anus, has the potential for the development of multicentric and multiple primary malignancies. Fifteen patients with 3 or more primary neoplasms in this region are presented. Awareness of the existence of these tumors as a regional disease and the possible long intervals between successive malignancies are emphasized. The presence of a vulvar neoplasm should arouse suspicion of a synchronous primary tumor elsewhere in the region. Conversely, sequential neoplasms occur more commonly after an initial cervical primary neoplasm and should be anticipated.