Hi ggonzo:
I want to add another 'you must get a second opinion' story. I'm someone who had never been in a hospital for anything. (Even hated being within one when my mom was sick last year). After I had my stroke, I never thought I would have a 'rare' disease. I thought it was all the junk food I'd been eating in the office (LOL).
I was very lucky enough to get a 100% confirmed diagnosis (I've learned that not all neurologists know about this disease so although my neurologist is not an expert, I was lucky that he was able to identify the disease and confirm diagnosis with MRA/MRI/angiogram test).
I bring this point up particularly because even diagnosis was confusing for us. The first surgeon we went to told us that I did not need surgery because I did not have 'symptoms' (i.e. TIAs). We went to get a second opinion and figured we would be okay as long as the two doctors said the same thing. The second doctor said I needed surgery and he was surprised I was not on aspirin (I had been told since I had a hemorrage that I should not take aspirin). BTW, the second was a mentor of the first doctor. Great, it was 1-1. We needed a tiebreaker. I sent my films to Dr. Steinberg -- and he said surgery -- so now we were 2-1 in favor.
Still we had confusion because he said direct and the second surgeon didn't say direct or indirect. The first had said direct would not be good in my case if I did have surgery. After much research (shout out to my brother who is a pediatrician and helped out a lot in understanding the medical terms), and one more opinion with another neurologist (who understands a lot about moyamoya who also recommended surgery), we finally felt comfortable in making the decision to go to Stanford (five days and counting!).
So, my point is, ask questions, get several opinions for diagnosis. If diagnosis is confirmed, make sure you do your homework. It's a pain (and believe me, I'm not a medical person - it's a totally foreign language to me). But it's worth it to ask a lot of questions, and get several opinions. And don't feel afraid to question doctors. It's not about their ego, it's about your (or the patient's) life. My family was very annoyed with the first doctor. After two of the four we had gone to contacted him to consult why he recommended no surgery, he contacted me to defend his decision and he ended up speaking with my brother who questioned his recommendation.
I think that doctor is very good at what he does (they were all experts who we consulted), but everyone has different experiences and you have to decide what's best for you and seek out all the information you can. The second doctor made the point to us that why would we want to wait until I have a debilitating stroke (which of course makes sense; something we did not think of before that). The first doctor had done the indirect on many moyamoya patients but all of his patients had had TIAs before he did the surgery. I had had a hemorrage, so his experience did not merge with my experience.
So again, keep all this in mind -- ask ask ask, research research research. Persistence pays off in anything you do.

Hope this helps and I hope everything works out for you.
Trina