Make sure you Find a cardiologist who specializes in aneurysms or is highly familiar with them, there are factors beyond the size of it, like your body size, family history, etc that I believe are taken into account, mine did not get to 5.5 and they told me to have surgery as soon as possible, I’m 5’ 6” so they considered 5.2 large for my size. There were also several cases of aneurysms in my family that influenced their decision. My cardiologist is an aneurysm nerd, a lot of his research is on the subject and the genetics behind them, the surgeon also highly suggested surgery, so not a real choice for me