[Malignant fibrous histiocytoma of the kidney]

Malignant fibrous histiocytoma formerly called malignant fibroxanthoma is a pleomorphous sarcoma with partial fibroblastic and histiocytic differentiation. When its primary localization is in the kidney, it cannot be differentiated from some forms of "sarcomatoid variants of renal carcinomas" described in 1983 by Tomer and Farrow. The present authors described a malignant fibrous histiocytome of the left kidney in a 63-year-old man, who died from generalization 11 months after operation.