Endometriosis of the omentum and borderline ovarian malignancy.

A symptomatic pelvic-abdominal mass in a 29 year old female was found to be bilateral ovarian serous cystadenomata of borderline malignancy. In addition, a thickened region of the omentum was removed and proved to be endometriosis. Endometriosis of the omentum is rarely reported and this case may mark a unique association with ovarian serous cystadenoma of borderline malignancy. The possible origins of omental endometriosis include metastasis and metaplasia. Omental endometriosis is rare and should be included in the differential diagnosis of omental tumors.