Anomalous drainage of left renal vein.

A rare anatomical variation found during routine anatomical dissection for teaching purposes in which the retro aortic left renal vein opened in to the left common iliac vein instead of inferior vena cava. Retro aortic left renal vein is an uncommon anomaly in the development of Inferior Vena cava (IVC) and its collaterals. It may courses behind the abdominal aorta to enter the IVC. According to the reviewed literature, incidence of a case like this is around 0.16% and is only scarcely described in the literature. The embryological and clinical significance of the above variations have been highlighted in this communication.