[Giant Right Coronary Artery Aneurysm Causing Acute Myocardial Infarction;Report of a Case].

We report a case of giant right coronary artery aneurysm causing acute myocardial infarction. A 59-year-old man presented with syncope and referred to our hospital in ambulance. Electrocardiogram showed acute myocardial infarction of the right coronary artery, and emergent coronary angiography was performed. Angiography confirmed a giant coronary artery aneurysm in the mid-portion of the right coronary artery. He underwent aneurysmectomy and coronary artery bypass grafting to the posterior descending artery. Spontaneous rupture of a giant coronary artery aneurysm is rare, but critical condition such as acute myocardial infarction or fistula to heart chamber can occur. Surgical intervention is indicated for a giant coronary artery aneurysm to prevent possible life-threatening consequences in the future.