Retroaortic inverted Lt renal vein: a rare anomaly found in a renal donor

Awareness of the renal vascular anatomy, including variants of the renal vein, is important for abdominal and renal surgery including renal transplantation. The complex embryological development of the renal vein results in the following variations: additional renal veins (ARVs), on the left side, circum-aortic renal collar and retro-aortic renal veins. We are going to report a case of 35 years old renal donor who had a rare renal vein anomaly that had been shown by computed tomography (CT) angiography. The left renal vein was single, and just before draining into IVC made two branches craniocaudally, which both passed retroaorticly and separately entered the inferior vena cava. Key words: renal vein anomaly, CT angiography, renal donor