Partial anomalous pulmonary venous return (PAPVR) is a congenital heart defect, which means it’s present at birth. It happens when one or more of a baby’s veins are attached to the wrong part of the heart or another blood vessel. Although PAPVR is “partial” and not as critical as total anomalous pulmonary venous return (TAPVR), early diagnosis and treatment is critical. If your baby has PAPVR, our board-certified, fellowship-trained pediatric .