In this procedure, the provider frees a ureter from a ureteral obstruction due to a retrocaval ureter, a rare congenital anomaly in which the ureter passes behind the inferior vena cava. The provider uses one of two approaches to repair the anomaly. He may dissect the ureter to repair the retrocaval ureter or he dissects the vena cava into two ends, repositions the ureter in front, and reanastomoses, or surgically reconnects the vena cava. A retrocaval ureter is also known as a circumcaval ureter.
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