Was the doctor talking about the Trigeminal nerve?
In my case, my tumor is apparently pressing on my trigeminal nerve. When I first started noticing odd things in my mouth--scalded tongue, numbness in my lips, cheek, etc., I mentioned it to my dentist as I thought it had something to do with some dental work I'd had, though that was years ago.
He immediately mentioned the mandibular branch of the trigeminal nerve and thought I should see a neurologist. By the time my neurologist appointment came around, the numbness had spread up the whole side of my face. It's not severe numbness, but it involves my mouth (scalded tongue, "off" taste, numb palate and gums, inside/outside of my cheek), my nostril, my eye, my forehead and my scalp all on my AN side.
The trigeminal nerve covers sensation to those parts of the face--the mouth, the cheek and eye and the forehead and scalp--while the facial nerve has to do with motor control of the face. That's the way I understand it, anyway.
So, if your AN is or was touching the trigeminal nerve, that would account for such sensations (or lack of sensation, as the case may be.)
In my case, I'm having radiation treatments, so the tumor will still be sitting in there, and may still press against that nerve, and it may or may not shrink at all. My doctor said that it's likely that the numbness will continue indefinitely, even after treatment.
Fortunately for me, it doesn't really interfere with my every day life, except that my eye tends to feel dry, so I put drops in it each morning and most nights. Otherwise, I'm used to the odd sensations, I guess.