Congenital Aneurysm of the Left Aortic Sinus

AN aneurysm restricted to the left aortic 1A.t sinus is extremely rare. Aneurysms of an aortic sinus most often involve the right (related to the right coronary artery) or the posterior (noncoronary) sinuses. The left aortic sinus may participate with the other two in aneurysmal dilatation, such as occurs in the Marfan syndrome. Described in this communication is an aneurysm that involved the territory of the left aortic sinus in a patient with a congenitally bicuspid aortic valve. The purposes of this report are to demonstrate that an aneurysm may occur in this region and to indicate that by displacing and compressing the left coronary artery, the aneurysm was responsible for coronary insufficiency and myocardial infarction.