脂肪肉瘤根据其所含的主要细胞成分又分四利组织类型。即粘液样型、圆细胞型、分化良好型和多形性脂肪肉瘤。作者回顾分析了48例四肢脂肪肉瘤的MR和CT表现。男性26例,女性22例,年龄20～85岁。48例脂肪肉瘤位于大腿者32例(67%),膝关节5例(10%),臀部3例(6%),肩及肩胛部3例(6%),前臂2例(4%),小腿2例(4%)。影象学分析肿瘤中含脂肪的百分率(0、<10%、10%～25%、26%～75%、>75%),有无钙化和出血,CT上肿瘤的密度(大部分等于脂肪密度、高于脂肪密度而低于骨骼肌、等或高于骨骼肌密度),T_1和T_2加权象信号强度(低于骨骼肌、等于骨骼肌、高于骨骼肌而低于脂肪、等或高 Liposarcomas are divided into four types of tissue according to the major cellular components they contain. That is, mucinous, round cell, well-differentiated, and pleomorphic liposarcoma. The authors reviewed the MR and CT findings of 48 cases of limb liposarcoma. There were 26 males and 22 females, aged 20-85 years old. Forty-eight cases of liposarcoma were found in 32 cases (67%) in the thigh, 5 cases (10%) in the knee joint, 3 cases (6%) in the buttocks, 3 cases (6%) in the shoulder and scapular area, and 2 cases (4%) in the forearm. Two legs (4%). Imaging analysis of the percentage of fat in tumors (0, <10%, 10% to 25%, 26% to 75%, >75%), presence or absence of calcification and hemorrhage, tumor density on CT (mostly equal to fat Density, above fat density but below skeletal muscle, etc. or above skeletal muscle density, T_1 and T_2 weighted image signal intensity (below skeletal muscle, equal to skeletal muscle, above skeletal muscle but below fat, etc. or high