结果2 7例46只肾首次超声检查发现有肾盂分离者，经动态观察有37只肾盂分离完全消失。

Result Pyelic separation has been originally discovered by ultrasound in 46 kidneys of 27 cases and according to dynamic observation it disappears completely in 37 kidneys.

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单侧输尿管梗阻组（U）：大鼠行手术剖腹，分离并于肾盂下结扎左侧输尿管，同时术前一天开始每日给以安慰剂生理盐水灌胃处理；

UUO group rats received an operation with left ureteral obstruction below the renal pelvis and were also gavaged with saline daily;

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