Objective To evaluate the therapy effects of retrograde urography combined with intravenous urography(IVU) for no-opaque ur eterolith location in extracorporeal shock wave lithotripsy(ESWL).

• 目的观察逆行插管造影和静脉尿路造影(IVU)联合定位碎石治疗输尿管阴性结石的疗效。