Hi, Jen:
Allow me to express my empathy with the re-growth situation you appear to be facing.
I would be very careful to establish the fact that it really is a tumor re-growth and not scar tissue. MRI scans are not always all that clear. You may want to consider sending the scans to the House clinic in Los Angeles for an 'outside' diagnosis. Just a thought.
As for total tumor removal: that is rare and I think many surgeons think they 'got it all', but do not. If only one tumor cell survives the surgery, well, you know what happens. My surgeon never even considered trying for a total removal as my tumor was too big (4.5cm) and I was adamant about not touching the facial nerve, as I had no problems there. Instead, he removed about half the tumor and I had FSR to kill the remaining cells. I have been told that this approach has been almost 100% effective, to date. Translation: no re-growth. I'll be having semi-annual MRI scans this year, the first scheduled for April, then on an annual basis for 'a long time', according to my neurosurgeon. It's worth it.
As your re-growth is small, you'll definitely have the option of radiation, which, as you know, is non-invasive. While not complication-free 100% of the time, both CK and GK generally have a good record of success. As always, do the research and do use doctors who are very experienced in both the process and using it to treat acoustic neuroma tumors.
Jen, you are in my prayers and have my best wishes for a positive outcome to this stressful situation.
Jim