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A 58-year-old Japanese man with variant angina developed acute myocardial infarction (AMI). Emergency coronary angiography demonstrated thrombotic occlusion in the proximal site of the left anterior descending artery. The occluded region appeared to be coincident with the area in which severe vasospasm had been provoked by intracoronary administration of acetylcholine 1.5 years before the onset of AMI. This case may give us a unique opportunity to consider the role of vasospasm in the etiology of AMI.

A Case of Acute Myocardial Infarction. Intracoronary Thrombus Formation at a Previously Provoked Vasospasm Site.