Total anomalous pulmonary venous return


Total anomalous pulmonary venous return (TAPVR) is an anomaly wherein all pulmonary veins drain into the systemic veins or into the right atrium. In order for the patient to survive, an interatrial communication (right-to-left shunt), either an atrial septal defect (ASD) or patent foramen ovale (PFO), is necessary. The current case represents type I (supracardiac), the most common of the four, and accounts for 55% of TAPVR cases. The common pulmonary venous sinus drains into the right superior vena cava (SVC) through the left vertical vein and left brachiocephalic vein. On frontal chest radiographs, this cardiovascular anomaly resembles a snowman or figure of 8.