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This case highlights the importance of proper identification of congenital anomalies of the coronary sinus for the successful placement of left ventricular lead during cardiac resynchronization therapy device implantation. We discuss an alternate route for left ventricular lead placement via the vein of Marshall when the coronary sinus ostium in the right atrium was atretic and was facing difficulty initially in detecting the anomaly.

Acute Aortic Dissection (AAD) is a life-threatening condition, which presents with a wide variety of symptoms ranging from being asymptomatic to sudden cardiac death. A retrograde extension of AAD can lead to partial or complete occlusion of coronary vessels, leading to an exceedingly rare presentation in the form of acute Myocardial Infarction (MI). A prognosis of AAD depends on prompt diagnosis and urgent surgical intervention to re-establish coronary blood flow. Here, we report a case of AAD, presenting as acute anterolateral wall MI, due to total occlusion of the left main coronary artery.