Primary umbilical endometriosis presenting as umbilical drainage in a nulliparous and surgically naive young woman.

Endometriosis is well known as a chronic condition associated with significant morbidity. Umbilical endometriosis, however, may go unrecognized because of its rarity, leading to multiple medical visits and a delayed diagnosis. Chronic umbilical drainage is an unusual presentation for umbilical endometriosis.