Hi B.,
I don't have any experience with NF1, but my son did have an MRI of the brain at 13 months, so I wanted to share those details with you.
Honestly, it was much harder on me than it was on him. I have had a brain MRI, so I knew about the procedure, but at 33 have never been under anesthesia, so I was considerably worried about that part. Of course there is always a risk, but in general most babies don't have any problem with anesthesia. The hardest part was not letting him eat that morning. He was not the youngest, so was not the first appointment of the day and could not eat until his MRI was over, which was well after 1 p.m. He was terribly cranky when he woke from the anesthesia, and the doctor explained that can often be a side effect of the anesthesia, but with him, it was only becasue he had not eaten. Beforehand, they told me I could feed him as soon as he woke up, but then when we were in recovery, they would not let me feed him until after we left. As soon as we got to the car, I started stuffing Cherioes in his face and he was a happy camper.
The procedure itself went off without a hitch. They let me stay with him until they put the mask over his face with the gas. As I understand it, with most babies, that is all that is necessary, but becasue my son had some severe chest congestion at the time, they intubated him (put a breathing tube down his throat) to be on the safe side and gave him IV anesthesia as well. The procedure took about an hour, and I had to wait in the waiting room, which was hard. I did a good job of holding it together until my husband called to mke sure everything was going okay and asked "did you cry?" Then the waterworks began. It is hard to be seperated form your little one like that, but seriously, everything was fine, and by the time we were home that afternoon, he was back to his normal self, none the worse for wear.
Also, talk to your doctor and insurance comapny and see if you can find out how much is covered and approxiamtely what your out-of-pocket expense will be for the procedure. I did not do that becasue I was so worried about everything else, and I was SHOCKED at how much it cost us, even with insurance, becasue there are separate charges for the procedure (use of the equipment), the anesthesia and the doctor (we are on a one-year payment plan now). Not that there is anything you can do to change the cost, but at least that way you know what to expect.