<unk>  is a congenital defect of the<unk>  veins.
Anomalous pulmonary venous connection
Pruned pulmonary vasculature
Congenital stenosis of vena cava
Congenital absence of the pericardium
Persistent left superior vena cava
Persistent left inferior vena cava
Endocardial cushion defect
Right ventricular outflow tract obstruction