Note that unlike the benign lipoma, this tumor has few areas of the yellow color of lipid. In contrast, there are areas of hemorrhage due to the rapid growth and the poor quality of the capillaries in the lesion. Tumor of adult life, with a peak incidence between 40 and 60 years of age.
Retroperitoneal tumors occur somewhat more frequently in women.
There is no evidence that any race or geographical area is more prone to develop liposarcomas. The three most common locations are the thigh, the retroperitoneum, and the inguinal region. Liposarcomas typically manifest a lobulated appearance. Cut section may reveal a mucinous appearance, especially if the myxoid component is prominent. Typically, at least some evidence of yellow color, due to the lipid material, is present.