Thank you so much for your answer. I still haven't talked with my physician, but after reading up on this, I feel I am in a better position to understand the condition.
Again, thanks.
Maria
I attempted to review the medical literature but there is virtually no literature on this topic. I would get the MRI to see if this is truly a cyst. Sometimes people with a previous history of syphilis get aortic aneurysms or cysts. If that is not your case you may have cystic medial necrosis..I think the MRI will help clarify.