A 66-year-old male patient had an acute inferior wall myocardial infarction 55 days prior to the admission to the hospital. Echocardiogram and cardiac catheterization disclosed a tumor of the left atrium and the coronary arteriography was normal. The tumor was surgically removed and pathological examination revealed it to be a myxoma. In the absence of other etiologic possibilities, left atrial myxoma was considered the main hypothesis with the development of thrombi and coronary embolization.