I have been watching my aneurysm for 5 years. It is theoretic aortic descending aneurysm , It started at 3.6 and grew about 2mm every 6 months. It got to 5.5 and they wanted to do surgery. But at 77 years old, I decided I did not want to have surgery. Be sure you find a surgeon you trust. Then follow their lead. Good luck. Sometimes they do stop growing.