Primary renal malignant fibrous histiocytoma: case report.

We report on a case of primary renal malignant fibrous histiocytoma. Primary manifestation in the kidney is rare with only 22 cases reported in the literature. Preoperatively, a renal cell carcinoma cannot be distinguished from a malignant mesenchymal tumor with clinical or imaging techniques. We discuss the pathologic differential diagnosis, therapeutic strategies and prognosis of this infrequent tumor.