上腹部に偏位し大網奇形腫が疑われた卵巣成熟奇形腫の１例

抄録

　Extragonadal teratomas are rare and account for only approximately 0.4% of all teratomas. The pathogenesis of extragonadal teratomas is controversial and poorly understood. We report a case of an ovarian mature teratoma, which was discovered during autoamputation into an omental teratoma.

　A 47-year-old woman was referred to our department for evaluation of a computed tomography documented infraumbilical tumor (10 cm), with a high index of clinical suspicion for a mature teratoma. Although we suspected an omental teratoma, tumor resection was considered necessary, and we performed laparoscopic surgery in consultation with a gastrointestinal surgeon. Intraoperatively, we detected an upper abdominal tumor covered with the omentum. The left ovary was missing from the pelvis, and the left fallopian tube was identified in the upper abdomen and showed torsion and was connected to the tumor. The left ovarian and suspensory ligaments were not identified. The lesion was diagnosed as a left ovarian tumor, and we performed partial resection of the omentum and left adnexa. Histopathological evaluation of the resected specimen revealed an ovarian component in the tumor, and we diagnosed a mature teratoma. Laparoscopic surgery with cautious port placement and positioning is a useful diagnostic and therapeutic option in such cases.