Cor triatriatum sinister disclosed after diagnosis of acute myocardial infarction

We present a case of cor triatriatum sinister diagnosed occasionally after acute anterior myocardial infarction. For management of the acute myocardial infarction (AMI), urgent reperfusion therapy was successfully performed through the left anterior descending coronary artery. Thereafter, no complication associated with AMI occurred. Cor triatriatum sinister was diagnosed and assessed later by means of several modalities. Finally, medical observation was indicated for this patient. This case illustrates the importance of awareness of this congenital disease in an adult when echocardiography shows an abnormal linear echo in the mid portion of the left atrium.