肾盂积水伴双侧输尿管积水者动态观察，积水加重者，多与泌尿系梗阻有关。
It may be caused by obstruction, if hydronephrosis is complicated with bilateral hydroureterosis or hydronephrosis becomes more serious dynamically.
目的：评价低场强磁共振泌尿系水成像(MRU)对尿路梗阻性疾病的诊断价值。
Objective: To evaluate the diagnostic value of low-field magnetic resonance urography (MRU) in obstructive diseases of urinary tract.
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