I think it’s called a bovine aorta. It means you have four vessels branching off of it instead of three, which includes the vertebral artery coming straight off the aorta. The only time this makes a difference is during surgery. They have to be which is usually off the subclavian artery. I have a 4.2 ascending aortic aneurysm as well, which is remains stable for the last year and a half. It measures somewhere between 4.0 and 4.2 depending on how the scan is read, it’s one of those things where you eat as well as you can to keep your cholesterol down keep your heart rate and blood pressure down and then exercise aerobically moderately and, don’t let yourself stress out because it’s blood pressure spikes that are the problem. I really don’t know about sufficiency or how severe it is. I think it might go from mild to moderate to severe. I wish you peace of mind.