Retroaortic left renal vein joining the left common iliac vein

Retroaortic left renal vein joining the left common iliac vein is a rare co ngenital anomaly in the development of the inferior vena cava. To our knowl edge, only one case has been reported in the literature; however, its imagi ng features have never een described. A 27-year-old male presented with a 1 -year history of recurrent right flank pain, dysuria and fever (39 degreesC ). Computed tomography and MR venography showed a retroaortic left renal jo ining the left common iliac vein. We present and MR venography findings and discuss their feasibility in showing this congenital anomaly.