本期读片窗答案蒋蕴毅，邹爱华，华佳本例术前拟诊左肾下极良性占位可能．手术：左肾下极有一直径５ｃｍ圆形肿块向肾外突出，肿块包膜表面光滑，质地不硬，与周围无粘连，肿块与左肾下极实质分界清楚无浸润，探查左肾动脉、静脉和左输尿管上端均未见病理变化，肾门淋巴结... Jiang Yunyi Jiang Yiyi, Zou Aihua, Hua Jia good preoperative diagnosis of this case may be extremely benign left kidney may occupy. Surgery: the left kidney under a very large diameter of 5cm circular tumor protruding to the outside of the kidney, the tumor capsule surface is smooth, the texture is not hard, with no adhesions around the tumor and the left renal clear boundary demarcation clear infiltration, exploration of the left renal artery, vein And the upper left ureter no pathological changes, hilar lymph nodes ...