Hi, Mary:
Based solely on what you've said here, I think radiation is probably your Mom's best option, for several reasons:
1. She is already experiencing symptoms of trigeminal nerve pathology (facial and tongue numbness and taste changes). The tumor is apparently pressing against or possibly wrapped around the trigeminal nerve. (The extracanalicular measurement along the cranio-caudal axis implies this). Surgical resection is far more likely to damage the trigeminal nerve further (sensory nerves are far more fragile than motor nerves), compared to radiation.
2. Given her age, and depending on her health and vigor, radiation will be easier for her. Regardless of age, radiation imposes a much shorter recovery time compared to surgery. CyberKnife and GammaKnife radiation have virtually the same success rates at controlling tumors as microsurgery.
3. Given the tumor's size along the cranio-caudal axis (from top to bottom), her facial nerve stands an exponentially better chance of having its function preserved with radiation treatment vs microsurgery.
4. Given your Mom's tumor size, it is virtually certain she would lose all hearing on her AN side if she had microsurgery. Her risk of complete hearing loss with radiation is also very high, but -- statistically speaking -- considerably lower than with microsurgery.
Contrary to what your doctor said, your Mom's tumor size is
not a 10 on a scale of 1 to 10, so you can take comfort in that. Brain tumors can grow to be several times larger than your Mom's. That said, the size of her tumor puts her on a tight schedule for treatment if she wants to have radiation. Once the tumor begins to significantly push on the brainstem, most doctors will refuse to treat with radiation, leaving microsurgery as her only remaining option. I'm not saying you need to panic and rush her off to the hospital for treatment immediately, but you should not wait for more than a few months if you wish to preserve radiotherapy/radiosurgery as a treatment option. Also, the longer you wait, the more potential there is for her facial symptoms to increase and her hearing loss to escalate.
Here is a helpful link comparing radiation options with surgery (look for my post about 40% of the way down the page):
http://anausa.org/smf/index.php?topic=6670.0Best wishes,
TW