The fact that it is the root is much better news, as you can see from the chart, the baseline (normal diameter) root is a fair amount larger than the ascending aorta. Further, everyone's normal is a little different, so it's not so much the exact measurement by chart, but the relative difference from your individual normal that's most important. I'd certainly pay attention to the measurement as time goes on, but I think it may turn out to be just fine long-term. Anyone who has ever had an aneurysm obviously worries about getting another one, I do as well since I only had a minimal graft done, but there's actually a fairly low probability of a second aneurysm. One study I'd read indicated 2% odds at 10 years. By the way, are you on a beta blocker for blood pressure control? If you can tolerate it (I can, thankfully) long term, that's one method to possibly help prevent future aneurysm development.