Describe the three types of TAPVR.

In all three types, the pulmonary veins ultimately drain into the right atrium.
A. Supracardiac: drainage to the left brachiocephalic vein
B. Intracardiac: drainage to the coronary sinus
C. Infracardiac: drainage below the diaphragm through the esophageal hiatus to the portal vein, which is often obstructed, leading to severe CHF