Conclusions Ultrasonography technique is of importance in diagnosing of obstruction at ureteropelvic junction, but it is difficult to image ureter polyp, valve or ectopic vessel by ultrasonography.

• 结论超声显像对盂管口梗阻的诊断具有重要价值，而对输尿管息肉、瓣膜、异位血管等诊断困难。