Wow, an interesting thread to be sure!

While MM is something that I am still VERY green about as far as learning, MS is something that I have come to understand and have studied since my diagnoses in 1986.
(DJ, I promise, I won't turn this into an MS message board link!) HAHA

MS is a disease of the central nervous system. Multiple Sclerosis attacks the myelin sheath that is a coating of protection around your nerve endings, much like the insulation around an electrical chord. When MS eats away at the myelin to the point that it reaches the nerve itself, it leaves an "imprint" on the nerve known as a lesion. A lesion shows up on an MRI as a white shadow, or white dot.
For a CORRECT, confirmed diagnosis of Multiple Sclerosis, an MRI *MUST* show a minimum of three lesions, be it an MRI of the brain, spine, or pelvis. An MRI showing one or two lesions should be correctly diagnosed as a demylinating disease or disorder, but not the label of MS.
Please understand, that I am no doctor. I have researched this disease for more years than I care to remember. Hehe
Why some neurologists like to raise to a Dx before they know for sure, I don't think any of us will ever know. I can't possibly imagine, after seeing (many many) MRIs of MS and MRIs of MM, that a doctor could have a Dx that far off. Perhaps it might be that the radiologists didn't reccognize what MM looks like?
I am sorry to hear that there are a group of you here that went through this misdiagnosis. There seems to be more than enough information and research on MS to this date, that sincerely, there is no need to have it missed or worse, misdiagnosed.

The only other thing that I might suggest is make sure that your neurologists are personally looking at your MRIs, instead on simply relying on the reports of the radiologists. Nothing personal against radiologists, honest, but we are talking about two life-altering diseases.
Neurologists have also used other tests, such as spinal taps, certain T1 cell research, etc. to diagnose MS, but as good as those tests are, they can show problems that MS can bring on, but can not eliminate other probems as being the cause(s) as well.
(OK DJ, I'm done - maybe.)

I hope that this information is of some help to you.
-= Dewski =-