Abstract Background: Retrorectal masses can present to the gynecologist as chronic pelvic pain and can have multiple etiologies. This article reports on a case of a retrorectal mass of uncommon origin. Case: A patient had a prior hysterectomy and bilateral salpingo-oopherectomy. She subsequently presented with a pelvic mass. Magnetic resonance imaging suggested that a cystic mass was displacing the rectum. Intraoperatively, the cyst was found to be retrorectal. Pathology indicated that the mass was of ovarian origin. Results: The final pathologic diagnosis was a benign ovarian Brenner tumor with a fragment of fallopian tube, including a paratubal serous cyst. The patient had no malignancy and had an unremarkable postoperative course. Conclusions: Ovarian remnants can present as retrorectal masses. The differential diagnosis of a retrorectal mass should be expansive and include ovarian and fallopian-tube tumors. (J GYNECOL SURG 26:281)