We studied the angiogrpahic findings in 65 patients with congenital pulmonary atresia, ages 4 days to 14 years(mean 3.3yrs). from 1981 to 1986 at Severance hospital Yonsei Univeristy . 1. 6 had pulmonary atresia with an intact interventricular septum, 38 had int with cardiac anomaly Renodynamically simulating TOF, and 21 associated with more complicated cardiac anomalies. 2. In the group with an intact ventricular septum, 5 showed confluent intrapericardial pulmonary artery, all segmental pulmonary arteries connected to intrapericardial artery. 3. In the group simulating TOF, aorta arose form RV with or without overriding in 35. In 27 patients with confluent intrapericardial pulmonary artery, 23 had more than 10 segmental pulmonary arteries connected to intrapericardial artery and 5 had severely hypoplastic hilar pulmonary arteries. In 11 with nonconfluent in trapericaredial pulmonary artery, 4 had more than 10 segmental pulmonary arteries. 4. In the group associated with mor complicated cardiac anomaly, included 8 patients with atrioventricular discordance, 7 with univentricular heart and 6 with tricuspid atresia. In 17 patients with confluent intrapericardial artery, 16 had more than 10 segmental pulmonary arteries connected to intrapericardal artery, one showed severe hypoplasia of hilar pulmonary arteries. In another 4 with nonconfluence, no one showed more than 10 segmental arteries connected to intraperdicardial or hilar pulmonary artery.