My husband has an enlarged aorta , cause unknown. He has been tested for Marfans, but although he has a lot of the physical symptoms of it, does not appear to have it. His aorta has increased in size very quickly. His cardiologist is talking about putting a cage around the aorta to prevent further enlargement. What are the risks of surgery , and will this problem shorten his life span ? He is otherwise fir and healthy, but does have haemochromatosis.