Video 4 ( A ) Right anterior oblique (RAO) caudal view showed large aneurysmal dilatation of left circumflex artery (LCX) and large LCX to coronary sinus fistula. ( B ) RAO caudal view showed delivered Amplatzer duct occluder to large LCX to coronary sinus fistula. ( C ) RAO caudal view showed closed large LCX to coronary sinus fistula by Amplatzer duct occluder with small residual flow.

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