There's a lot of information that you're not including here that would definitely impact any "cost/benefit" advice on this forum. Your best bet would be to discuss your concerns with your primary care physician and your cardiologist. They should have a clear understanding of your health, as well as your ability to deal with side effects of an important vaccine that might possibly affect your aneurysm. FYI.....I have taken the covid vaccine annually since it became available, had Covid a number of times, and also have a thoracic aneurysm...currently 4.5cm.... that has grown slowly over the past 8 years, but has stabilized due to improved BP control. I'm a 71 y.o male.