Extraretroperitoneal abdominal malignant fibrous histiocytoma.

Seven cases of extraretroperitoneal abdominal malignant fibrous histiocytoma (MFH) are reported. The anatomic distribution was as follows: liver (2 cases), spleen with gastric and pancreatic involvement (1 case), mesentery (1 case), right mesocolon (1 case), left mesocolon (1 case), and urachus (1 case). These bulky lesions were often extensively necrotic; calcifications were seen in 2 cases. All 7 cases were investigated by ultrasonography (US) and computed tomography (CT). Barium studies were performed in 4 cases, and angiography in 3 cases.