label: Sinus venosus atrial septal defect
label_lc: sinus venosus atrial septal defect
description: "An interatrial communication caused by a deficiency of the common wall between the superior vena cava (SVC) and the right-sided pulmonary veins. SVASD is commonly associated with anomalous pulmonary venous connection (APVC) of some or all of the pulmonary veins, which produces additional left-to-right shunting."