本文報告兩個腎臟平滑肌肉瘤的案例：第一個案例為一具有完整包膜的腫瘤，且為低細胞分裂率。經術後三十個月追蹤檢查，並無腫瘤復發或遠處轉移的現象。第二個案例則為左側腰痛合併血尿已有十年的病史，而且經由經靜脈腎盂攝影發現左腎腫瘤已有八年。病理切片報告為界限明顯的腫瘤，且無淋巴或遠處轉移的現象。病人於術後十三個月仍無腫瘤復發或轉移的現象。我們並做有關平滑肌肉瘤的文獻回顧。

Two cases of renal leiomyosarcoma were reported: The first case showed a well-encapsulated tumor with low mitotic rate. There was no tumor recurrence or distant metastasis after 30 months of follow-up. The second case had a history of left flank pain with hematuria for 10 years, and a left renal mass noted by intravenous urography (IVU) for 8 years. The specimen revealed a well-defined tumor without lymph node invasion or distant metastasis. The patient has been kept tumor free for more than 13 months. The literature concerning leiomyosarcoma of the kidney is reviewed.