Objective To evaluate the coincident ratio of MR urography(MRU) in demonstrating the ureterohydronephrosis and cause of the upper urinary tract obstruction by comparing with IUP,B-ultrasound,CT,surgical operation,pathology and clinical result.

• 目的 通过磁共振尿路造影(MRU)与静脉尿路造影(IUP)、B超、电子计算机断层扫描(CT)及手术、病理学检查和临床结果对照研究,评价MRU在上尿路积水及其梗阻原因诊断中的价值。