肾母细胞瘤(Wiems氏瘤),在小儿腹膜后肿瘤中居首位。而双侧肾母细胞瘤很少见,北京儿童医院总结二十多年收治的307例腹膜后肿瘤中:肾母细胞瘤149例,占49％;其中左侧82例,右侧66例,双侧仅1例。日本文献至1982年也仅收集40余例,我院所收治的肾母细胞瘤中,亦仅有此例现报导如下: 王××,男,7个月,汉族,住院号10499982年4月1日入院。患儿腹部出现肿物半年余渐大,形体消瘦,近二月来腹部 Wilms tumor (Wiems tumor), in children with retroperitoneal tumors in the first place. Bilateral nephroblastoma is rare, Beijing Children’s Hospital summarized more than 20 years admitted 307 cases of retroperitoneal tumors: 149 cases of nephroblastoma, accounting for 49%; of which 82 cases on the left, the right 66 cases, Bilateral only 1 case. Japanese literature to 1982, only collected more than 40 cases of nephroblastoma admitted to our hospital, and only this case is now reported as follows: Wang × ×, male, 7 months, Han, hospital number 10499982 in April Admission on the 1st. Abdominal appendages appear more than six months, body weight loss, abdomen in recent February