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目的：分析肾血管平滑肌脂肪瘤（ＲＡＬ）的非典型ＣＴ表现，探讨提高非典型ＲＡＬ的ＣＴ诊断水平。材料和方法：回顾分析了２５例经手术、病理证实的ＲＡＬ的非典型ＣＴ表现，并与病理结果对照。结果：２５例ＲＡＬ非典型ＣＴ表现为：（１）较均匀的脂仿密度（７例）；（２）较均一的软组织密度（４例）；（３）伴肾静脉、下腔静脉栓塞（２例）；（４）其它：肿瘤与邻近结构界面不清、出血、合并其它肾病变（１５例）。结论：适当的扫描方法是ＣＴ诊断非典型表现ＲＡＬ的关键。
OBJECTIVE: To analyze the atypical CT findings of renal angiomyolipoma (RAL) and to explore the value of CT in diagnosis of atypical RAL. Materials and Methods: A retrospective analysis of 25 cases of pathologically confirmed RAL of atypical CT manifestations, and pathological findings. Results: The 25 cases of atypical RAL showed: (1) more uniform lipid density (7 cases); (2) more uniform soft tissue density (4 cases); (3) with renal vein and inferior vena cava embolism 2 cases); (4) Others: unclear interface between tumor and adjacent structures, bleeding, combined with other nephropathy (15 cases). Conclusion: The appropriate scan method is the key to CT diagnosis of atypical manifestations of RAL.