Ureteral obstruction by a rare venous anomaly: a case report

Aberrant blood vessels are a rare cause of ureteral obstruction. A case is reported of right upper ureteral obstruction that simulated radiologically a retrocaval ureter. At operation the ureter was obstructed by an aberrant vein going from the right spermatic vein to the inferior vena cava. The obstruction was relieved by dividing this vessel. Aberrant blood vessels should be considered in the differential diagnosis of extrinsic ureteral obstruction.