我科自１９９５年至今共收治５９例肾积水患儿，经Ｂ超、ＩＶＰ检查确定为肾盂输尿管部梗阻４２例，采用改良术治疗，效果满意。现报告如下。临床资料：本组患儿皆为肾盂输尿管交界处梗阻所致肾积水４２例，其中男３１例，女１１例；年龄３月～６岁不等，以６个月到３岁居多；? Our department since 1995, a total of 59 cases of children with hydronephrosis were treated by B ultrasound, IVP examination identified as ureteropelvic obstruction in 42 cases, the use of modified surgery, with satisfactory results. The report is as follows. Clinical data: The group of children with hydronephrosis caused by obstruction of the junction of the ureteropelvic 42 cases, including 31 males and 11 females; aged 3 months to 6 years of age, to 6 months to 3 years of age mostly;