H there & welcome!
The #1 question I would ask the surgeon is how many
MoyaMoya people he/she has personally cared for. I contacted Mayo in Minnesota when I was first diagnosed two years ago. Things may have changed, in fact I'm sure they have, but 2 years ago I was not satisfied with how much experience the neurosurgeons I was referred to there had with MoyaMoya. In fact, upon my first contact with them, they were searching high and low for a surgeon that had
any experience with it or even knew what I was talking about.
I am by no means trying to discourage you from going to Mayo for this! They are known to be highly reputable facilities and as you heard Janice's sister was treated for MM there. For all I know, they may have since had the opportunity to treat hundreds more diagnosed with MM but I do feel that this is an important question to ask of a surgeon. A surgeon's
experience and
indepth knowledge of this particular disease is absolutely key.
Try to read all you can on the board in the "Links" section and all the individual stories. There are great experiences here to learn from. And, ask away- we were all at the same place you are right now at one time or another!
Hang in there!

Lisa