Anomalous formation of inferior vena cava

Inferior vena cava (IVC) is a composite vessel and the precise mode of development its post renal segment is somewhat uncertain. Because of the various transformations that occur during its development, variations do occur, but are not common. The common anomalies of abdominal part of IVC include absence of hepatic segment of IVC and a double IVC. An anomalous formation of the inferior most segment of the IVC is reported and discussed wherein the IVC was formed by the union of left common iliac vein and right external iliac vein at the level of S-1/S-2 vertebra. The right common iliac vein was absent.