My hearing has never improved, nor do I notice any fluctuations either. I've been told several things by different health professionals regarding my hearing and none of it is very encouraging. I was told that I would lose all the hearing in my AN side from the doctor who worked at the GK center. I was told by one audiologist that the nerve will atrophy over time, unless it is stimulated, such as using some kind of hearing aid. I was told by another audiologist that the hearing nerve has probably been denied oxygen because of the tumor and that it is why it is not conducting anything other than a small amount of sound to my brain. I have lost all word recognition in that ear and some sound gets through, and I am classified as severely deaf in that ear, which is a notch above profoundly deaf. I am under the impression that it is very rare for hearing to get better, and I am cheering on anyone who is lucky enough for that to happen to them. It will be interesting to see if over the course of years, if people will retain their hearing or if it will deteriorate gradually. I hope that isn't the case, of course. For me, it went fast and it's gone for good. But then, I had GK and your question was for Cyberknife. Don't know if that makes much difference, really. Thankfully the fullness sensation went away before I had my GK. And I am very thankful for that.
Off to bed!
Sue in Vancouver, USA