INTRAPELVIC RETROPERITONEAL SCHWANNOMA -A REPORT OF TWO CASES-

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  • 仙骨前面に発生した神経鞘腫の2例

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Abstract

We report two cases of retroperitoneal schwannoma which were difficult to diagnose preoperatively. The first patient, a 56-year-old man, was seen at the hospital because of pollakiuria. CT scan showed a large mass which occupied almost the entire pelvic cavity accompanied by a low density portion in its central part. Tumor extirpation was perfomed under a diagnosis of retroperitoneal tumor. The tumor was 21×12×6.5cm in size and 1, 180g in weight with a thick capsule. Histological diagnosis was schwannoma. The second patient, a 73-year-old man, was found having a pelvic tumor incidentally, when he underwent a close examination for rectal cancer. Magnetic resonance imazing (MRI) showed a large mass in the presacral space, which had a central necrosing part. Abdominoperineal excision of rectum and an extirpation of the tumor were perfomed. The extirpated tumor was 9.2×7.4×7.0cm in size and 230g in weight. It had a white and thick capsule. Histological diagnosis was benign schwannoma composed of two different types, Antoni-A and B. Schwannoma often presents difficulty in preoperative diagnosis. It has been reported that malignant change of the remnant tumor or metastasis from it can occur after operation. We must attempt to remove the tumor completely.

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