Unusual duplication anomaly of the inferior vena cava with normal drainage of the right IVC and hemiazygous continuation of the left IVC.

Duplication of the inferior vena cava (IVC) and other IVC anomalies have been well described in the literature. Although they are often discovered incidentally in patients without symptoms, these anomalies can have significant clinical implications and must be recognized when they occur. In most cases of a duplicated IVC, the right and left iliac veins drain into the right and left IVC, respectively, and the left IVC ends at the level of the left renal vein, subsequently draining into the right IVC. The authors describe a unique case of duplicated IVC with hemiazygous continuation of the left-sided IVC and normal drainage of the right-sided IVC into the right atrium.