[Retroperitoneal inflammatory fibrosarcoma; a case report].

A 62-year-old man was admitted to our hospital complaining of lower abdominal mass and weight loss. Computed tomography and magnetic resonance imaging studies revealed a large tumor occupying the pelvis and expanding into inferior vena cava, which reached to the renal pedicle. Open biopsy was undergone under general anesthesia. Histopathological diagnosis was inflammatory fibrosarcoma. Five courses of chemotherapy including vincristine, actinomycin-D and cyclophosphamide (VAC) resulted in 35% reduction of the tumor volume in one direction, indicating that VAC could be an alternative effective therapy for inoperable inflammatory fibrosarcoma.