On Table Detection of Persistent Left Superior Vena Cava Draining into Superior Aspect of Left Atrium in a Case of Ostium Secundum Atrial Septal Defect - A Case Report

Persistent Left Superior Vana Cava (LSVC) draining into coronary sinus is not a rare entity but LSVC draining directly into Left Atrium (LA) is very rare. It is quite often overlooked on transthoracic echocardiography and many a time escaped detection during right and left heart catheterisation. We present a case of ostium secundum (OS) atrial septal defect (ASD) where LSVC was present and it was draining directly into superior aspect of LA. This was diagnosed on table. Once it is identified, operative correction is mandatory to prevent right to left shunt and its known CNS complication.