Hydronephrosis caused by ureterosciatic herniation.

A 69-year-old woman with history of operation for stress urinary incontinence presented with left flank soreness. Physical examination revealed knocking tenderness at left costal-vertebral angle. Her serum creatinine level was 1.2 mg/dL and urine analysis was negative. Ultrasonography showed left hydronephrosis, and computed tomography scan revealed ureterosciatic herniation. An antegrade placement of the indwelling ureteral stent was performed. After 3 months, the double J catheter was removed and the patient recovered without recurrent symptoms.