Hi Brad,
As Jim explained these tumors are generally slow growing, but may experience growth spurts. We also had stories of patients with fast growing ANs, without having an indication of malignancy. Loss of hearing may or may not mean that the tumor is growing. In its presence an AN may destroy then nerve fibres slowly, even if it is not growing. Also hearing can be lost gradually, over the course of a few months or years, or overnight. Another MRI taken at a reasonable time interval, say of 6 months, can give some indication of the rate of growth (if any) at that time frame.
In terms of hearing tests, you should know that in addition to the pure tone threshold, what is most important is the level of word recognition that you have (it should be written somewhere in your report). You may have loss in the low, or high frequencies, or both, but if your word recognition is good, then a conventional hearing aid can help. However if the word recognition is poor (which unfortunately is common in AN patients), then your hearing is not considered "useful". In any case, these are all good questions to ask the neurosurgeon you will consult with.
In terms of the MRI report, without being a doctor, it basically gives you the dimensions of your AN: 1.2 cm AP is the measurement from front to back, 1 cm CC is the vertical dimension, and 1.9 TR is the transverse direction (from side to side). The transverse is very important, because it usually correlates with the degree of brain stem compression (if any) etc. The way your TR measurement is reported most likely it includes the portion (i.e. tail of the ice cream cone) going into the internal auditory canal. The other thing that your report says is that the ventricles, that are responsible for the circulation of the CSF fluid, are normal. This is good, as it means that the AN is not causing obstruction of CSF flow. The last thing the radiologist mentions is that although most likely the tumor is an AN, a meningioma is another possibility; these are also benign tumors of similar appearance and the treatment method is generally similar.
Lists of questions to ask the neurosurgeon have been posted in the forum, and you can find them by using the search function. Make sure to ask him what nerves are involved (especially facial and potentially the trigeminal, since you mentioned numbness). Ask about brain stem compression and how severe it is. Also what is his sense of urgency based on what he sees on the MRI scans.
As Jim mentioned, experience is key. My guess is that probably the neurosurgeon in Thunder Bay will not have sufficient expertise. You could ask him if he can provide any referrals for consultation for stereotactic radiosurgery. Even if you are not interested in this option, the GK centre at Toronto Western involves both neurosurgeons and radiation oncologists, and is a way to get into the loop and see other more experienced neurosurgeons. You can also ask your GP to provide referrals to the doctors I mentioned in my previous post.
Good luck with your appointment and keep us posted.
Marianna