Fig. 1

Embryology of anomalous pulmonary venous drainage. This diagram illustrates right sided pulmonary veins failing to establish a normal connection with the left atrium and instead draining into the inferior vena cava. UV = Umbilicovitelline vein; CCV = Common cardinal vein; LB = Lung buds; LA = Left atrium; RA = Right atrium; LV = Left ventricle; RV = Right ventricle; SVC = Superior vena cava; IVC = Inferior vena cava; ARPV = Anomalous right pulmonary vein