Superior sinus venosus defect (SVD) with partial anomalous pulmonary venous connection (PAPVC)

Partial anomalous venous connection (PAPVC) is a rare congenital heart disease where the blood flow from one or more pulmonary veins (but not all) returns to the right atrium or systemic venous circulation and is often associated with a sinus venosus atrial defect (SVD).