It involves a complex process comprising 3-pairs of embryogenic veins: posterior cardinal (iliac and confluent), subcardinal (renal and hepatic) and supracardinal
The post-hepatic IVC develops between the sixth and eighth weeks of embryonic life as a composite structure formed from the continuous appearance and regression of three paired embryonic veins, the posterior cardinal, the subcardinal, and the supracardinal
1) Failure of the left caudal supracardinal
vein to regress results in persistent communication between the left common iliac vein and the left renal vein.
Left sided IVC develops as a result of the persistence of the left supracardinal
vein, and prevalence of this anomaly is estimated to be 0.
During early embryogenesis, the posterior supracardinal
and more anterior subcardinal veins are formed.
Duplication of the IVC is a rare anomaly of the infrarenal segment (due to persistence of the supracardinal
veins), with an incidence of 0.