Ovarian teratoma presenting as a pedunculated polyp at colonoscopy.

A 41−year−old woman (gravida 2, para 2) was admitted to hospital with intermit− tent abdominal pain which she experi− enced during defecation. Her medical his− tory was uneventful. Colonoscopy re− vealed a hyperemic, polypoid mass with a stalk, 15 cm from the anal verge (Fig− ure 1); computed tomography revealed a right ovarian mass that was continuous with the intraluminal lesion in the sig− moid colon. At surgery, a right ovarian mass was identified which was adhering to the sigmoid colon and to the pelvic peritoneum on the right side. Right sal− pingo−oophorectomy and an anterior re− section with a colorectal anastomosis were performed. The resected specimen included a pedunculated polyp of the sig− moid colon, which was continuous with an ovarian mass (Figure 2). The length of the polyp stalk was 1.8 cm. The pathologi− cal diagnosis was a benign mature cystic teratoma which had ruptured, leading to the formation of a colonic fistula, and which had subsequently protruded into the colonic lumen. The patient had no postoperative complications and was dis− charged from hospital 8 days after the op− eration.