Hi Steve,
I was actually listening to a recorded phone message each evening after treatment to monitor my hearing level. I noticed that after the second treatment that the pitch I was hearing with my treated ear was significantly lower than what I was hearing with my good ear. Before treatments it was the same pitch, just muffled in the AN ear. I've had two previous episodes of 'sudden hearing loss' in the AN ear (one a few years before AN diagnosis, one earlier this year), ultimately recovering to the present level of 50% speech recognition. I took prednisone for the hearing loss earlier this year, so they decided to put me on that again instead of Decadron. Everything still sounds slightly lower in my AN ear now, two weeks after CK, but I can hear well enough to carry on a phone conversation (using AN ear) most of the time.
My AN is about 2 cm diameter. I don't remember the IAC extension measurement, but I think it is a little less than expected for the overall size of my tumor. The docs said it was a little unusual to be concerned with preserving hearing with an AN this size, because hearing has typically been lost already. This was a consideration in prescribing the 5 Gy/day x 5 day protocol, but I honestly don't understand that process at all. I had some concern if the dose was sufficient to kill the AN, but the radiation doc pointed out that the tumor center would be getting 25% "hotter" (more radiation) than the AN margin. He felt confident in the numbers based on previous experience and published data, so we'll see.
Anyway, so far, so good. I wish you well with your treatments.