Hi, Jennie:
Your father should also ask for an ABR (auditory brainstem response) test to find out how weak his hearing nerve is. If it is very weak, it may not survive the trauma of surgery. Esteemed neurosurgeon Derald E. Brackmann (of the House Ear Institute in L.A.) usually orders an ABR test for those patients, like your dad, for whom retaining hearing is absolutely critical. The outcome of the ABR test usually determines his prognosis for whether hearing can be preserved with surgery. The ABR test is non-invasive, painless and quick (takes about 15-20 minutes).
Do not -- repeat, do
not -- trust the opinion of only one doctor. Because ANs can be treated in more than one way, each doctor will be biased and tend to recommend that the form of treatment that they specialize in is the best course of treatment. The only way to get a good idea of the best course of treatment for your dad is to consult two or three (or more) doctors who specialize in different forms of treatment (surgical resection, CyerKnife, GammaKnife or standard fractionated stereotactical radiation). In some cases, they will all or most of them agree one particular form of treatment is best for your dad's particular case. But they might all disagree. What you need to ask each of them is what are the percentage changes of hearing loss (and permanent facial paralysis, another possible side effect and important consideration) for the type of treatment they recommend. My advice is to go with the treatment that offers the lowest percentage risk of hearing loss. That could very well be some form of radiation treatment. In fact, people with small tumors are usually excellent candidates for radiation treatments.
Of all the types of radiation treatments available for ANs, CyberKnife offers the best statistics on hearing preservation. A few world-renowed doctors offer free consultations to people with ANs. Contact Dr. Steven Chang (possibly the world's most experienced CyberKnife practitioner, with roughly one thousand operations performed) for a free review of your dad's MRI, ABR, etc. and consultation by phone/email. His email address is sdchang@stanford.edu. Dr. Chang is also a neurosurgeon (he resects tumors he thinks are not best suited to radiation treatments.)
Also ask Derald E. Brackmann for a free review of your dad's MRIs, ABR, etc. and a free consultation by phone/email. Be sure to mention your dad is blind, as that is a big factor.
Keep in mind that the term "hearing preservation" is bandied about quite often by doctors but doesn't necessarily mean what it sounds like. You can lose all but the slightest vestige of useful hearing and still be considered to have "preserved" hearing. You should ask each doctor what the chance of additional hearing loss -- no matter how slight -- is with each type of treatment.
For more info, check out my posts at these links (half-way down each page):
http://anausa.org/smf/index.php?topic=6670.0(compares the pros and cons of different types of treatments for ANs)
http://anausa.org/smf/index.php?topic=6657.0Best wishes,
TW