Thanks for the support. After consulting with the Gamma Knife Team at Toronto Wesrtern, as well as Dr Sumit Agrawal at university Hospital in London (dr. Parnes' partner) we agreed that Gamma Knife was a good option. There was some doubt about whether the AN was impinging on my facial nerve, and the consequences of that complicating the surgery really ended the conversation about surgery. My AN is quite small (1 cm), and restricted to the bone passage between the ear and brain. So GK seemed an obvious choice. I had the procedure done last week. After an initial headache (diminished over several days) and tiredness, I felt pretty fit. If I had to guess, though, I think there have been some detrimental effects to my balance (I weave a bit when I walk, bump into things, am tippy) and hearing -- I guess that's going to go regardless -- as well as worse tinnitus. I guess I won't know for sure if the GK worked until 6 month follow up MRI.