Hi Jen--I, too, have re-growth of the 1 cm rt AN I had removed via retrosigmoid/suboccipital in Jan of 2001. Last June (2006) it was determined indeed it was re-growtn (as first 3/4 years looked like scar tissue or variance in MRI films). Didn't tell my kids (grown kids, son age 35 and daughter age 29) until late August as son was getting engaged and didn't want to worry them)... Anyway I have seen two neurosurgeons, a neurotologist, two radiation specialists and soon to see another radaition specialist at Mass Gen Hospital (Boston, MA)as it is clear to me that surgery (per Dr Barker at Mass General) would present a 10% possibility of further damaging my already weakened facial nerve and no sense to wait and see as it's almost the size it was before, so radiation is my best option--now I have to decide what kind and how many sessions--I will see Dr Loeffler at Mass Gen March 21 to discuss this... This grows slowly (usually) so take your time to decide and be sure to ask about your facial nerve!
My heart goes out to you as I know we all had hoped once it was removed it would be gone forever, but there was a 5% chance of regrowth and so now we have to move forward. I only have my two (wonderful I might add) grown kids and my son is getting married Juy 15 and this all weighs heavily on me but I am thankful that surgery is not my only optiuon!!!
Take care and hope all turns out wel!!! Mary from MA