Dilated coronary sinus mimicking posterior left ventricular aneurysm.

Dilation of the coronary sinus is mostly a congenital lesion. As acquired lesion it was found to be associated with poor left ventricular function. In the present case an angiographic diagnosed posterior left ventricular aneurysm was during surgery found to be a dilated coronary sinus. Preoperative left ventricular function was normal.