Agenesia da veia cava inferior

agenesis of the inferior vena cava is a rare malformation. its most common cause is dysgenesis during embryogenesis, but it may also be related to intrauterine or perinatal thrombosis. it is usually asymptomatic, associated or not with other congenital malformations and may be related to increased risk of chronic venous insufficiency and deep vein thrombosis, especially in young individuals. diagnosis is often incidental, during abdominal surgery or radiological procedures. we reported five cases of agenesis of the inferior vena cava detected during electrophysiological procedures.