If unilateral, it may be due to obstruction at the level of the ureteral orifice and above, as from a calculus or neoplasm, or less commonly a stricture from inflammation.
如为单侧肾脏病变阻塞部位位于输尿管及以上，如结石、肿瘤或较少见的炎症所致的狭窄。
2
Methods The ultrasonic enhanced image with drug was performed for 51 cases suspicious ureteralcalculus patient.
方法应用药物增强超声显像，检测51例可疑输尿管结石患者。
3
Objective To investigate the efficacy and side effects of ureteroscopic pneumatic lithotripsy (URSL) and extracorporeal shock-wave lithotripsy (ESWL) in the treatment of ureteralcalculus.