Total anomalous pulmonary venous return is a congenital (meaning it’s present from birth) heart disease that affects the pulmonary veins. Arteries carry blood away from the heart; veins carry it toward the heart. The pulmonary veins are very important: they carry the “red” blood that has picked up oxygen in the lungs back to the heart to be …
https://www.chop.edu/conditions-diseases/total-anomalous-pulmonary-venous-return-tapvr