Malignant Peripheral Nerve Sheath Tumor Arising from the Mesentery of the Sigmoid Colon—Report of a Case—

Abstract

A 67-year-old woman was admitted with urinary urgency and a lower abdominal mass. Abdominal CT showed a tumor 120 mm in diameter that was vascularized by the sigmoid colon artery in the abdominal cavity. The tumor was diagnosed as liposarcoma. We performed sigmoidectomy in June 2011. Intraoperatively, the tumor was about 15cm in diameter and located at the sigmoid mesocolon adjacent to the sigmoid colon. Histological examination confirmed the diagnosis of malignant peripheral nerve sheath tumor (MPNST) originating from the sigmoid mesocolon. She received two operations for tumor recurrence, and adjuvant chemotherapy after the third operation, but died of abdominal dissemination 26 months after the initial operation.