@gcgc Hi Gabrielle....in nearly all cases, surgery isn't considered until a thoracic aortic aneurysm reaches 5-5.5cm. You will be more closely monitored if growth is detected following regular scans. At your size of aneurysm, you may be checked less frequently, depending on your doctor. Proper blood pressure control is important, as are lifestyle modifications, if needed. It may be worthwhile to establish yourself as a patient with a cardiologist who has aneurysm expertise. Best wishes for "no growth" and good health!!