Hi Dave - I see from your profile that we aren't too far from each other - we lived on Cape Cod for 26 years and now are snowbirds returning to the Cape for the summer after spending the winter in Florida (not too far from the Red Sox spring training camp).
I've been a W&W patient for 8-1/2 years with a 9th cranial nerve schwannoma - sort of like an acoustic neuroma but on the 9th nerve rather than the 8th. My first MRI was in 2001 after a bad headache which turned out to be blood pressure related but instead I heard - "you've got a brain tumor"
It first measured 9 mm but I was told on second opinion by a neuroradiologist that it was a tad larger. During the past almost 9 years, it has changed by only 5 mm (up to 14 mm) with no symptoms although lately I have been a little more lightheaded and dizzy but it's a bad allergy year and I'm hoping that's my situation.
I would go more with my symptoms than the size of the tumor and have already decided if/when anything needs to be done, that I will have radiosurgery - probably Cyberknife at the Beth Israel.
Good luck and keep us posted.
Sheryl