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Objective : Mature cystic teratoma of the greater omentum is a very rare tumor which is difficult to diagnose accurately before treatment, and its origin is not yet clear. We experienced a case of mature cystic teratoma of the greater omentum resected by laparoscopic surgery.
Patient : The patient had a history of right salpingo-oophorectomy by laparoscopic surgery because of struma ovarii in another hospital. She was referred to our hospital after transvaginal ultrasonography in follow-up examination revealed recurrence of the tumor. Magnetic resonance imaging findings were suggestive of mature cystic teratoma of the right ovary, but given her right adnexa had been resected we diagnosed her mature cystic teratoma of left ovary.
We performed laparoscopic surgery. Intraoperatively the left ovary was normal, and there was no right adnexa. Careful examination of the abdominal cavity showed a 7 cm tumor in the inferior greater omentum. There was no tumor adhesion to the uterus or adnexa, and it was resected easily by a vessel-sealing device. Gross examination showed a tumor consisting of fat and hair, and the pathological diagnosis was mature cystic teratoma of the greater omentum.
Conclusion : It is important that ectopic mature cystic teratoma is considered when transvaginal ultrasonography findings are suggestive of tumor. Laparoscopic surgery is useful for the detection of accidental tumor in the abdominal cavity and for the resection of mature cystic teratoma of the greater omentum.
