Total anomalous pulmonary venous return – Overview – Mayo …

In total anomalous pulmonary venous return, sometimes called total anomalous pulmonary venous connection, the blood vessels that lead from the lungs (pulmonary veins) attach to the heart in incorrect places, instead of attaching correctly to the upper left heart chamber (left atrium). This is a heart defect present at birth (congenital).

https://www.mayoclinic.org/diseases-conditions/total-anomalous-pulmonary-venous-return/cdc-20385613