Sonographic appearance of primary liver liposarcoma

Primary malignant mesenchymal tumors of the liver are extremely rare. We report a case of a primary liposarcoma in the right hepatic lobe of a 50-year-old man. Sonography showed a poorly defined, lobulated, infiltrating echogenic tumor with shadowing. Within the tumor were hyperechoic and hypoechoic foci thought to represent areas of hemorrhage and necrosis. Color Doppler sonography showed the mass to be avascular. A low-attenuation mass of fat density was confirmed on CT. The resected tumor was reasonably well circumscribed, with demonstrable infiltration of the liver parenchyma. Histologic analysis showed liposarcoma with high-grade sarcomatous features.