A co-operative retrospective study of I7 patients with congenital coronary artery fistula was undertaken.The right coronary artery was the most common vessel involved and the right ventricle was the site of drainage in the majority of the patients. Three methods of drainage of the fistula into the chamber are described. The majority of the patients were under 20 years of age and were asymptomatic. All the patients above the age of 35 were symptomatic. The symptoms and the cardiomegaly on the chest x-ray were well correlated with the size and duration of the shunt.The physical signs, electrocardiograms, chest x-rays, cardiac catheterization data, and angiocardiographic features are described. Points