Lesions on the brain are the hallmark symptom of MS. I didn't show any when I had an MRI with contrast when my CFS acutely onset 4 years ago. My brother and sister both have MS- so I will be having another MRI soon to rule it out again.
i have read that atypical MS might be linked to XMRV as well, im starting to think that all fibro,MS,CFS,ME, Autism are all due to some virus the problem is that there are too many of them out there for us to know hopefully in the near future the FDA will look into designing a viro chip like the one they used to identify XMRV on the prostate cancer samples even the guy who invented the viro chip said that he would have never thought it would be a MLV virus when he found it he said he would've never looked there and if it wasn't because the viro chip picked it up we would never even know it can infect humans... i think a lot of it too has to do with which specialist you are seeing or you are referred to, one might say is MS one may say it's something else when in reality it could be a virus, maybe a lot of people have XMRV but for some reason affects some more then others and that's when different diagnosis are made