History: 40 year old with abdominal pain and diarrhea.
Congenital anomalies of the inferior vena cava in about 0.2-0.5% of the population. Left sided IVC, which is this patient’s diagnosis, is seen in up to 0.5% of the population. Other anomalies besides transposition of the inferior vena cava include azygous continuation of the inferior vena cava, circumaortic left renal vein, and retroaortic left renal vein. These congenital variants are benign and usually require no treatment, but are important to be aware of in case of future intervention requiring access through the inferior vena cava.