Cardiac catheterisation of a 6-month-old asymptomatic infant with a continuous precordial murmur revealed a congenital coronary artery fistula draining into the right ventricle. Following a period with no complications and the disappearance of the cardiac murmur, recatheterisation at the age of 4 years showed spontaneous complete closure of the fistula. This case in connection with 3 similar cases from the literature suggests that in asymptomatic patients with a congenital coronary artery fistula surgery might be delayed until school age in order to give spontaneous closure a chance.