Abstract
Coronary artery fistula is an abnormal direct connection between the coronary artery and any of the four chambers of the heart or great vessels. A fistula from the left circumflex coronary artery to the coronary sinus is a relatively rare situation. We report a case of 12-month-old infant with coronary artery fistula from the left circumflex coronary artery to the coronary sinus that was identified incidentally. The N-terminal pro-brain natriuretic peptide level was elevated. Additionally, the proximal segment of the left circumflex coronary artery was dilated. On the basis of these findings, percutaneous closure of the fistula was performed with a vascular plug. This procedure achieved no residual flow and good hemodynamics were observed during follow-up.