I think? This is why good docs worth their salt do all the tests they do! IF there are no key lesions in the brain which can't be explained [in my case? scarring from a couple of solid concussions] then it's likely not MS... Family history helps here too.
I believe this web site is up in the 'stickies'? But here it is again...:
http://www.neuroexam.com/content.php?p=2
This is a good primer on what a neuro does during an exam and what he/she is looking for in the process.
IS a Doc telling you you mite have MS? Have you gone to the MS forum here at NT? Web up MS and PN diagnosis or diagnostics and I'll bet you'll see a few key differences.
IF only one doc is saying MS and others not? Time to go get another opinion in my humble opinion! I was lucky in that I only had to go to FOUR neuros before I got my diagnosis... and later four more to confirm it as two of the latter four didn't believe me? But, part of it was what I call 'professional politics' between docs...and I'll leave it at that.
Also? IF your neuro IS a MS specialist? He/She mite be trying to fit you into a box you don't fit into. Just a thought but often too true. IF you can? Get copies of the test reports and web up that type of report...often they come with a summary [Mri's and CT's and the like] which once you get THOSE are very valuable. Docs interpret, according to their training. Not according, necessarily to their appropriate diagnostic protocols for any given disease. Bias does exist? So second, third or more opinions- IF your insurance allows it can be worth it for the long run! Hope and hugs ! - j