Cystic Retroperitoneal Mass Due to Ureteral Injury as an Outcome of Lumbar Disc Hernia Operation.

R organ injury, especially ureteral injury, is a rare complication associated with surgical repair of lumbar disc hernia (LDH).(1-3) A 44-year-old male patient was admitted to the urology department with a history of left flank pain, fever, and intermittent hematuria. He had a history of repeat surgical repair of an LDH at the same level 1 month previously. Ultrasound examination revealed a multiloculated cystic mass anterior to the psoas muscle, and abdominal computed tomography scan showed grade 1 hydronephrosis with proximal ureteral dilatation and free fluid in the pelvis (Figure 1A and B). A 10 French (F) pigtail ureteral drainage catheter was percutaneously inserted into the cystic mass under ultrasound guidance with a prediagnosis of abscess or urinoma (Figure 2). Owing to continuous urine drainage, antegrade pyelography was performed at the time of fluoroscopy and revealed ureteral discontinuity and extravasation of contrast material (Figure 3). Therefore, a 10 F nephrosto-