For ascending aortic aneurysms associated with an abnormal aortic valve, the operation involves removing both the aorta and the aortic valve. Referred to as the Bentall Operation, both aortic valve and ascending aorta are replaced with a Dacron graft to which is attached a prosthetic aortic valve. As part of the operation, the coronary arteries are removed from the aorta and re-attached to the aortic graft.