Thirty patients with coronary aneurysms associated with Kawasaki disease underwent coronary arteriography. Of 53 aneurysms, five were saccular, 24 sacculofusiform, 19 fusiform and five tubular. When tubular aneurysms were included in the fusiform type, the incidence of each configuration in the right coronary artery was almost the same as that in the left coronary artery. The left anterior descending coronary artery had the most aneurysms, followed by the right coronary, left main and circumflex arteries. Right coronary aneurysms always involved the bifurcation or the region from which a branch vessel arose; 13 of 31 left coronary aneurysms did not involve the bifurcation.