A Case of Pelvic Retroperitoneal Neurilemmoma Developing from the Obturator Nerve

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  • 閉鎖神経発生と考えられた骨盤内後腹膜神経鞘腫の１例

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Abstract

A 54–year–old woman seen elsewhere for lower left leg numbness persisting 2 years was found in magnetic resonance imaging (MRI) to have a tumor near the left ovary. She was referred to obstetrics and gynecology. Based on a diagnosis of mucinous left ovary tumor, she underwent laparoscopic surgery. Intraoperative findings showed no uterine or adnexal abnormalities bilaterally but a left pelvic retroperitoneal tumor was seen. Changing to laparotomy, we found a tumor attached to the ileum and sacrum and tightly fixed within the pelvis. Preoperative nervous symptoms suggested that it had developed from the obturator nerve. Pathological tissue findings showed mixed Antoni A and B and immunostaining was positive for s–100 protein, yielding a diagnosis of neurilemmoma. Although lower left leg numbness remained, the postoperative course was favorable and no recurrence observed in the 8 months postoperatively.

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