I was DX pre-MRIs, by a process of elimination. One hospital stay of a week, with all the blood tests you can imagine and a Myleogram, which showed the telltale protien and O-bands (and no tumour).

I didn't have a MRI, until I was re-DX, after a long remission, 18 years later. My Neuro at the time said that my MRI looked typically MSessy. I had one more MRI 4 yrs later, that read the same.

You don't need a MRI to DX MS. It's just one of the many tools Docs use in the DX process. Like all tests, if not done under the right circumstances with a knowledgable Doc/Scientist, to read the results, then it could have been a waste of time and money.

I refuse MRIs for MS now as they are unnecessary, once you have been DX. Any MRIs after that are for the Doc's curiosity and of no help to you. IMHO!