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A boy aged 16 years and 10 months had typical Kawasaki disease diagnosed when aged 1 year and 8 months. Selective coronary angiography at the age of 5 years and 7 months showed a giant aneurysm (diameter 8.6 mm) on the right coronary artery (segment 2), and dilatation of the left circumflex artery (segment 11; diameter 7 mm). Although coronary angiography at age 8 years 3 months showed similar dilated lesions at segments 2 and 11, a new small dilated lesion with a diameter of 2.7 mm appeared at segment 4 (arrow). The dilated lesions at segments 2 and 11 were smaller at age 12 years and 4 months, and calcification was apparent in the aneurysm at segment 2. Two new aneurysms were observed at age 16 years and 10 months, one in the left anterior descending artery (segment 6), and the other in the right coronary artery proximal to the formerly existing aneurysm (arrow). Mild localised stenosis was detected at the proximal and distal ends of the aneurysm in segment 2. The aneurysm in segment 4 increased to a diameter of 4 mm.