Abstract
Lumbar vessels are usually four in number on each side, the veins drain into the inferior vena cava and arteries arise as dorsal branches of the abdominal aorta. The arteries supply the posterior abdominal wall and spinal cord. The veins drain the abdominal wall and vertebral venous plexus. Both travel behind the psoas major muscle, posterior to the kidneys. During routine dissection for the undergraduate students, in two cases we found a left lumbar vein coursing anterior to the left kidney, draining into the anterior aspect of the left renal vein. In one of these cases, a left lumbar artery accompanied the lumbar vein. Developmentally, the vertical segment of the lumbar vein is perhaps the persisting posterior cardinal vein and the horizontal segment crossing the anterior aspect of the left kidney the persisting left post- subcardinal anastomosis anterior to the mesonephros. Clinically, the knowledge of this variation is important not only for the radiologist in imaging of the renal veins but also for the surgeons dealing with this area, specifically for the live donor left kidney nephrectomy using the retroperitoneal approach.
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