A sinus venosus atrial septal defect is a type of atrial septal defect primarily associated with the sinus venosus.

They represent 5% of atrial septal defects.

[1] They can occur near the superior vena cava or inferior vena cava, but the former are more common.

[2] They can be associated with anomalous pulmonary venous connection.

[3] This cardiovascular system article is a stub.