Thanks, Rose, for the specific mention of B12 deficiency. How could I have neglected to mention that ? Vitamin E and CoQ10 deficiencies are also associated with cerebellar ataxia, and googling cerebellar ataxia with any of these should bring up lots of supporting data. Now, one would hope that the good doctors at Mayo would have considered these things, but you never know, and lab tests are not 100% accurate in determining underlying deficiencies. We know from personal experience how often B12 deficiency goes unrecognized for so many reasons. I'd want to be sure I had strong levels of all of these.

Cara