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目的:探讨CT未见脂肪成分的原发性腹膜后脂肪肉瘤（PRPLS）的CT特征。方法:回顾性分析128例经手术病理证实的PRPLS中43例CT未见脂肪成分病例的CT特征，评估内容包括肿块多结节状或多结节融合状、肿块的异质性。结果:43例CT未见脂肪成分的PRPLS中，多结节状或多结节融合状28例（65%），单发肿块15例（35%）；CT平扫异质性17例，增强异质性18例，平扫异质性和增强异质性13例，平扫异质性或增强异质性22例（51%）。结论:肿瘤的多结节状或多结节融合状，特别是异质性有可能为CT未见脂肪成分的PRPLS诊断提供帮助。

Objective:To investigate the CT imaging features of fat-poor primary retroperitoneal liposarcoma ( PRPLS).Methods:The CT signs of 43 fat-poor PRPLS cases among 128 PRPLS patients confirmed by pathology, including multiple nodules composing or multiple nodules fusing, tumor heterogeneity, were retrospectively evaluated.Results:Of 43 fat-poor PRPLS cases, 28 cases(65%) showed multiple nodules composing or multiple nodules fusing on CT images, 15 cases (35%)demonstrated single mass. Seventeen cases showed tumor heterogeneity on pre-contrast scan, 18 cases showed tumor heterogeneity on contrast scan, 13 cases showed tumor heterogeneity on both pre-contrast and contrast scan, 22 cases (51%)showed tumor heterogeneity on pre-contrast or contrast scan.Conclusion:CT signs of multiple nodules composing or multiple nodules fusing, especially tumor heterogeneity may help establishing diagnosis of fat-poor PRPLS.