Hi, Niki,
Just ran across this last night and thought it had more info than the other site - even talks about being able to monitor progress in MVD for hemi-facial spasm, which might be the "spread" they were talking about. Not sure that works for TN MVD, though - different nerve.
INTRA-OPERATIVE MONITORING
Anyway, don't want to add to your stress but info is power and it's good to know they're covering all the bases for you!
Good luck and take it easy - we'll all be thinking of you!
Jean