我們報告壹腎臟魛肪瘤病例，因其臨床表現疑似腎細胞癌而接受腎切除手術。腎包膜脂瘤及腎脂肪瘤均為少見病例。選擇性腎動脈攝影可以診斷其良性本質，從而避免不必要之根除性手術。

A case is reported of intrarenal lipoma which had undergone nephrectomy erroneously under the mistaken impression of renal cell carcinoma. Renal capsular lipoma and internal lipoma are rare. Angioraphic characterization may help in accurate identification of such benign lesions, and prevent unnecessary radical surgery.