This rare type of ASD presents an interatrial communication via an unroofed coronary sinus. Therefore, the defect is seen at the site of origin of the coronary sinus. A persistent left SVC is associated with this defect and can often be seen to drain into the coronary sinus or left atrium.
This defect may not be visualized on routine trans-thoracic echocardiography. However, the defect may be suggested by the constellation of right heart overload, a dilated coronary sinus, and the presence of a persistent left SVC. Multiplane transesophageal echocardiography
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