[Multimodal treatment for MFH originating from the psoas muscle-a case report].

A 51-year-old male presented with lower abdominal mass and thigh and lumbar pain. CT scan showed a large retroperitoneal tumor compressing the lumbar vertebrae and IVC. Arterial infusion of mitomycin C, epirubicin and DSM was performed for unresectable tumor. The tumor was shrunken and the infusion repeated in 6 and 10 weeks later until right femoral palsy occurred. Radical resection with lumbar fascicles and psoas muscle and IORT (25 Gy) was performed. Local recurrence appeared before the sacrum in the next year. Arterial infusion and resection was done. Local recurrence invading the right common iliac artery was found five years later. The tumor and the artery were resected, followed by extra-anatomical ilio-iliac bypass. Local recurrences occurred in the 6th, 7th and 9th year. Radiation therapy was effective. But for the last recurrence, no radiation was applicable because of over dosage. As the most important thing in the treatment of MFH is to resect the tumor with curative margin at the initial operation, and the retroperitoneum and pelvic cavity are not good places to obtain good margins, multimodal treatment including irradiation should have been considered even preoperatively. Also consultation with orthopedic oncologists, radiologists, vascular surgeons and team practice are essential to get curative margins.