Giant Aortic Root Thrombus in a Chronic, Asymptomatic Stanford Type A Aortic Dissection.

Type A aortic dissection rarely becomes chronic because of high early mortality. Thrombus in the false lumen and an immobile flap are indicative of this condition. A 61-year-old man with an initial diagnosis of gastroenteritis later presented with a diastolic murmur. Echocardiography revealed chronic Stanford A aortic dissection with a thrombus causing severe aortic regurgitation.