Coronary artery fistula between left coronary artery and coronary sinus in newborn.

Aneurysmal circumflex coronary artery fistula connected to the coronary sinus is a rare clinical entity that usually remains asymptomatic until later in life. The timing of surgical treatment for asymptomatic patients is crucial. The decision to leave or exclude the aneurysmatic coronary artery following ligation of the fistula is controversial. Herein, we report the successful management of a coronary fistula between the circumflex artery and the coronary sinus without using cardiopulmonary bypass during the newborn period.