Total anomalous pulmonary venous return
The pulmonary veins gather in a single common pulmonary vein which is connected with superior vena cava, right atrium or inferior vena cava. The consequence is that oxygenated blood from the lungs return in the right side of the heart and is pumped in the lungs.
There is always a atrial septal communication through which part of the blood passes from the right atrium to the left atrium and the left ventricle and aorta.
In some cases, specially in the subdiaphragmatic form, the pulmonary vein is obstruct; it features an obstructed total anomalous pulmonary venous return.
The corrective surgery must be performed as soon as the diagnosis is made. The intervention consist in the connection of the pulmonary veins to the left atrium.