I think that this is where scans can be both a blessing and a curse. If we find something that is causing a problem, then they are great -- but if we find something that isn't causing a problem, and isn't likely to, then it is nothing but a worry-maker. When I was pregnant and had a kidney stone, they looked at my kidneys and said that one was smaller than the other. (One is supposed to be, but on me the one that was supposed to be larger was actually smaller.) Anyway, it wasn't what caused the problem with the stone, and they said I might (should? I really don't remember) want to check it out after I have the baby. Well, that was 6+ years ago, and I actually just remembered it the other day when I got a UTI. So now I am thinking "Do I want to check this out?" I have never had any other kidney issues to speak of, and my yearly exams have never shown anything abnormal. The HA in me wants to be "sure" though. I am going to discuss it with my therapist and my doctor at my yearly physical, I guess.
I guess my point is, all this technology can give us information that isn't relevant, or that we don't need. It can also generate a lot of worry. Probably a ton of people have the thing that you found on your CT and don't know it.