报告5例经手术病理诊断的原发性腹膜后巨大脂肪肉瘤。病程长短不一，巨大肿块与轻微症状极不相称，手术后容易复发。采用CT扫描。CT表现为混杂性低密度，含有脂肪组织成份，可见侵袭性生长，CT可作出定位和定性诊断。 Five cases of primary retroperitoneal giant liposarcoma diagnosed by surgical pathology were reported. The length of the disease varies, and huge lumps are not commensurate with mild symptoms and are prone to recurrence after surgery. CT scan. CT showed mixed low density, containing adipose tissue components, visible invasive growth, CT can be positioned and qualitative diagnosis.