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[A surgical case of right coronary artery-right atrial fistula complicated with postoperative myocardial infarction].

We report a 10-year-old girl with a right coronary artery-right atrial fistula and aneurysm formation. The proximal orifice was closed from the inside of the aneurysm, and the distal orifice through the right atrium under cardiopulmonary bypass. On the 9th postoperative day, myocardial infarction developed due to thrombosis in the fistula stump and the dilated coronary artery. Thrombosis may have been induced by postoperative dehydration and inadequate anticoagulant therapy. It is important to minimize a fistula stump and to strictly administer postoperative anticoagulant therapy.