Please do not go down that road second guessing an informed decision you made in concert with respected neuro doctors. It doesn't serve any purpose except to cause one stress. Just continue to focus on your recovery and the next steps in your treatment. And it could very well be it was the best decision to move ahead with surgery. I had a radiation oncologist tell me these usually slow-growing meningiomas can "turn" and suddenly become aggressive. Then, if you chose the watch-and-wait protocol, a lot could happen before the next annual MRI check up. You could have ended up in a worse situation with regard to the meningioma wrapped around/invading other sensitive structures.