Selective coronary angiography was performed in 110 cases (aged 1–45 years) of tetralogy of Fallot. Anomalies of surgical importance were seen in 26 cases (23.6%). In 17 (15.4%) these anomalies existed alone, and in nine (8.2%) they coexisted with relatively minor anomalies. Isolated minor anomalies involving the terminal branches existed in 15 cases (13.6%). The coronary arterial anatomy was normal in the other 69 (62.7%) cases. Our study shows that coronary angiography can safely be performed in patients with tetralogy of Fallot, providing the surgeon with vital information for subsequent planning of the time and type of surgery required.