While it is uncommon not to suffer hearing loss on the AN side, it is not unheard of. When I was diagnosed with my AN, which was much larger than yours (2.8 cm at diagnosis), my hearing was perfect. So, it had been growing for all these years, without causing any hearing problems. My only symptom was some burnt feeling on the tongue, and facial numbness. One of the doctors did question if it was an AN (versus a meningioma), but sure enough it did turn out to be an AN. Unless these are surgically removed it is hard to tell them apart (i.e. facial, versus trigeminal vs. acoustic neuroma, and meningioma), as they all look similar on the MRI. Generally they cause similar symptoms and the way they are treated is similar too. Facial neuromas are trickier to treat, because of the facial nerve involvement. They tend to cause facial twitches, and other such symptoms, which doesn't seem to be the case with you. We did have a member with a trigeminal neuroma, MAlegant; I am not sure how hers was diagnosed.
I hope this helps, don't get too caught up with what kind of a neuroma it is, it most likely doesn't change anything.
Marianna