I'm surprised at the rather abrupt manner your doctor is employing with you, considering the seriousness of AN surgery.
When I was diagnosed and consulted a highly recommended, very experienced neurosurgeon, he had a concise plan (debulking surgery, FSR) laid out for me and answered my every question during an uninterrupted 45-minute consultation. My MRI scan (showing the AN) was kept up on his viewer and he used it to show me what he had was intending to do in the surgery (Retrosigmoid) and explained why he was taking this approach. This doctor respected my intelligence, understood and addressed my concerns and was a total professional while also a gentleman. I had full confidence in this mature neurosurgeon and he justified it with a splendid surgical outcome.
The doctor you choose is, of course, a personal decision but you will have to live with the outcome of the surgery, not him, so please choose wisely.