Hidradeonoma Papilliferum of the Anus: A Case Report About the Relationship Between Neoplasms of the Mammary-Like-Glands and Hormones.

Hidradenoma papilliferum (HP) is a benign pathologic finding that has been described primarily in the vulvar region. While thought to arise from ectopic tissue along the mammary line, it is now known to also arise from mammary-like anogenital glands (MLG), which are part of the normal anogenital cellular and glandular milieu. Previous work has demonstrated the relationship between HP and hormone receptors, but this has not been documented in a clinical setting. In this case, we present HP in a patient undergoing infertility treatments, presenting with a painful, enlarging anal mass. Upon histopathologic review, the mass was found to be an HP with no malignant changes. This unique case adds to the existing literature on perianal HP. While this case follows the known clinical and histological patterns of HP, the unique temporal relationship to in vitro fertilization (IVF) treatment supports previous in vitrowork on the relationship between HP and hormone receptors.