Inflammatory malignant fibrous histiocytoma of the retroperitoneum.

The authors present a case of inflammatory malignant fibrous histiocytoma located in the left retroperitoneum. The tumor was resected enblock with kidney and suprarenal gland. During the resection the system of retractors called the pillars of Kocman was used which allowed wide exposure of the abdominal cavity. The tumor measured 23 x 17 x 10 cm with the left kidney and suprarenal incorporated. The tumor was centrally pseudocystic made of xanthomatous cells, foamy cells and rare giant cells with storiform formations and infiltrated with neutrophils. Imunohistochemically, the tumor cells were vimentin and CD 68 positive and CD 20, CD3, EMA, S-100, HMB 45, CD 34 and CD 1a negative. Neutrophils were CD 15 positive.