[A case of retroperitoneal fibrosarcoma: usefulness of magnetic resonance imaging]

A 62-year-old man with dyspnea was admitted to our hospital. Computed tomography showed a large right renal mass. Results of T1- and T2- weighted magnetic resonance imaging showed a very low-intensity region suggestive of retroperitoneal fibrosarcoma. On March 13, 1996, complete tumor resection and lymphadenectomy were done. The histopathological diagnosis was of fibrosarcoma. After the operation, the patient was treated twice with a combination chemotherapy regimen consisting of cyclophosphamide, vincristine, adriamycin and dacarbazine. At the most recent follow-up, 1-year postoperatively, the patient was well with no local recurrence or distant metastases.