Aim: To evaluate the possibility of using dynamic enhanced magnetic resonance image(MRI) to access the hydronephrotic kidney function which is not shown on conventional intravenous urography(IVU).

• 目的:了解动态增强磁共振成像(MRI)在评估静脉肾盂造影(IVU)不显影梗阻性积水肾脏功能中的应用价值。