Primary Extrapelvic Umbilical Endometriosis Presenting With Cyclical Umbilical Bleeding: A Case Report.

Primary extrapelvic endometriosis is the presence of endometrial tissue in sites outside the uterine cavity in an individual who has had no prior abdominal surgeries. Various theories have been postulated to describe the etiology of endometriosis. Our case study involves a multiparous patient in her late 40s with no prior abdominal surgeries who presented with bleeding from her umbilicus associated with swelling and pain corresponding to her menstrual cycle.