Hi, SS:
I concur with what others have said: ANs are virtually never fatal these days, unless you let it grow for many years unchecked. It would probably take over 30 years of steady, average growth for your small-to-medium-size tumor to kill you. Some ANs reach a certain stage of growth and then stop -- never to grow again. Dr. Derald E. Brackmann (famous neurosurgeon at HEI; he wrote the book on many surgical techniques for brain tumors) told me he has seen some ANs stay the same size for 20 years.
Of course, you can't depend on that happening. If you decide to forego immediate treatment, you must have an MRI every 6 months to monitor the tumor's size. Your MRI shows your AN is not touching your brainstem. So, if your symptoms are mild (and remain so) and you don't mind "watching-and-waiting," you probably have plenty of time (years) to weigh your treatment options.
I was petrified of getting treatment. I chose CK and cried the night before treatment, desperate for any way out of what seemed like a horrible fate. Now, 19 months after treatment, I feel way better than I did before getting treated. CK was a miracle treatment for me. Most other people on this forum feel the same way about the radiosurgery or surgical resection they underwent. We all know how scary it is for you right now; we've been there, done that. And, yes, it's not to be taken lightly. But I think you'll be surprised when you get to the other side of this -- after treatment -- how well you came through it all. I do not speak in platitudes when I assure you that you are going to be okay. Do your research thoroughly, exploring your options. Ask questions on this forum; we're here to help. You're going to be okay. Thousands of people on this forum who have also had, or still have, an AN can testify to this truth.
Best wishes,
TW