An Accessory Uterine Cavity as a Cause of Pelvic Pain

Pelvic pain is a common gynecologic problem. We report a case of a noncommunicating accessory uterine cavity as a cause of pelvic pain in a young adolescent.A 17-year-old nulligravida presented with worsening pelvic pain. Transvaginal ultrasound revealed a 3-cm cavity within the myometrium. Hysteroscopy revealed a normal uterine cavity. Surgical excision of the accessory cavity just lateral to the normal uterine cavity was achieved through laparotomy. Pathology confirmed endometrial tissue in the accessory cavity. Pelvic pain resolved after surgery.A noncommunicating uterine cavity should be considered in the differential diagnosis of pelvic pain.