[Coronary artery aneurysm developed acute myocardial infarction: report of a case].

A 68-year-old woman without angina developed acute antero-septal myocardial infarction. Coronary angiogram revealed saccular coronary artery aneurysm at the origin of the diagonal branch and relatively mild coronary artery stenosis. Emboli from the coronary aneurysm was strongly suggested. We placed coronary bypass grafts onto left anterior descending, diagonal and obtuse marginal branches, and excluded the coronary aneurysm by ligating both its inflow and outflow. The postoperative course was uneventful. There are several treatments of choice for patients with coronary aneurysm. We believe that surgery is mandatory and that exclusion of the coronary aneurysm should be considered in every possible case.