Mature cystic teratoma in one of two accessory ovaries

Abstract

  Although mature cystic teratoma is a common benign tumor, it is rarely found in an ectopic accessory ovary. Our patient was a 31-year-old woman in whom a right ovarian tumor had been suspected during an earlier pregnancy. Magnetic resonance imaging indicated a right ovarian mature cystic teratoma. Laparoscopy showed a tumor in the Douglas pouch. Her left adnexa and right tube were normal, but her right ovary, although in the proper position, was atrophied to the size of a fingertip, and was connected to a soybean-sized accessory ovary. The tumor in the Douglas pouch was also connected to the accessory ovary. The tumor had a knobby, hemispheric lesion on its surface, and filmy adhesions to the pelvic peritoneum and the colon. The tumor adhesions were delicate and detached from their surroundings, with no feeding structures. The tumor was pathologically diagnosed as a mature cystic teratoma. Because follicular cysts were found in the hemispheric area, it was classified as ovarian tissue. In conclusion, the tumor was diagnosed as a mature cystic teratoma arising in an ectopic accessory ovary.