Joe, it seems you and I like to do this stuff the same hard way, don't we? I got a call from my doc too . . . and I find out on Friday what they've "discovered".
I got thinking the worst, which is that it is a untreatable secondary malignant tumor, and yeah I'm freaked. I've had so many weird things with my health though, it's probably just some alien thing "they've never seen before" growing in there.
If I were you (and it seems I am almost

), I would take one thing at a time. I would put off the Tysabri treatment (a week or month isn't likely to make much difference anyway...), and deal with the immediate problem.
I sure hope everything works out for you with this cyst-thingy.
You two are not alone.
Cherie
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I am not a Neurologist, Physician, Nurse, or Hairdresser ... but I have learned that it is not such a great idea to give oneself a haircut after three margaritas
.