Hi Michael,
Thank you for your post, it is a very interesting scenario, will keep this in mind once I see the Neuro again after hey have redone ALL the tests, though I do NOT want another LP as I have already had 2 1/2 (don't ask!

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Today I go to the National Brain hospital in London for a repeat of ALL my EVPs, the first ones done in 2003 showed "Significant Demyelinating Disease", hence I got my Dx of "probable MS" as I have multiple lesions in the brain, also medical history etc,. BUT my LP was clear (evidentally there is a whole sub-group of MSers who have a negative LP)
So I start the whole process again today, they are even seding me to see a Neuro-psychologist next month (oh joy

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cheers
squiffs