Unroofed Coronary Sinus as Potential Cause of Ischemic Stroke Following Left Atrial Appendage Closure.

Unroofed coronary sinus is a rare type of atrial septal defect with a strong association with persistent left superior vena cava. We describe a case with unroofed coronary sinus and persistent left superior vena cava as a cause of recurrent embolic strokes following left atrial appendage closure for atrial fibrillation. (Level of Difficulty: Advanced.).