Perinatal inferior vena cava thrombosis and absence of the infrarenal inferior vena cava

We report a case of infrarenal absence of the inferior vena cava (IVC) pres enting as a major iliofemoral deep venous thrombosis in an adolescent. This is the first report of infrarenal IVC absence in which IVC thrombosis has been demonstrated in the perinatal period. We propose an association betwee n perinatal IVC thrombosis and subsequent infrarenal IVC absence. In additi on, the case demonstrates the importance of assessment for anatomical anoma lies in patients presenting with apparently idiopathic deep venous thrombos is.