Hi Snoopy,
I had a small AN growing on my 8th cranial nerve deep inside near my brain stem. My worse symptom were terrible vertigo attacks, the full spin variety lasting 2-3 minutes, recurring every 3-5 days. I chose the Middle Fossa approach to preserve my hearing, because the tumor was still small. They servered my vestibular nerve, in the hope of stopping the vertigo problems. It was a long road to recovery, but I am glad it is out. From what I have learned, the AN is rather slow growing, so some AN patients have the luxury of waiting, before they chose all the medical options that are presented to them. I have no knowledge about a cyst, but I believe they carry a lot of blood vessels in them, which could make your medical options different than those with a AN.
I'm sorry you have to go through this, but the good news is that medicine has come a long way in treatment, so learn as much as you can, get multiple opinions, so you can make the very best decision that is right for you.