Hey Keeping the Faith
You have hit the big question with these small tumors. I am a newbie and attempting to decide what to do.
Before I run wild with my situation, is your tumor intracanicular - I think that is rather key to my barage. I am gandering that the majority of people here, in particular those with larger tumors, have CPA tumors - those suckers have more of tendency to grow. I would gander with your growth rate, you have an intracanicular tumor - these little guys typically grow very slowly.
I will also admit I can't get my head wrapped around radiosurgery - just can't get comfortable with the idea. I am 37 years old, so age, for me plays a big factor.
So, my question for me if I were in your shoes (which I am not) - since tumor control isn't necessarily an objective (2mm over 4 years, could be easily be minimal growth/MRI normal range reading discrepancy), is your hearing better off with CK or doing nothing over the long term? If the difference is insignificant between hearing loss with CK versus doing nothing, is any treatment worth even the low risks of radiosurgery? CyberKnife isn't available in Canada - so it isn't an option. Much of my opinion is based the research I have done with GK - where hearing preservation rates are much lower than CK.
I have put this one out there several times - 10 year study of Conservative Mgmt of Vestibular Schwannomas
http://www3.interscience.wiley.com/journal/120090445/abstract?CRETRY=1&SRETRY=0In their study, in a relatively small population of 72 patients but followed on average for 10 years [I have the full study - my ENT sent it to me.]
All conservatively mgmt tumors - PTA of 45db at the start of the study - 10 years later it was worse by 36db (+/- 21 db)
Intracanicular tumors - PTA of 41db at the start of the study - 10 years later it was worse by 25db (+/- 16 db)
So, I am in the camp (3 months into this journey - so grain of salt) that if I have minimal growth <2mm, no other symptoms other than hearing loss, I will take the average 25db loss with no risk. Since I am starting probably closer to a hearing loss of 25db (so very minor), maybe I will get the lower loss of only 16db - and I will be cruising 10 years from now.
Of note, I am also probably more inclined to wait it out with minimal/no growth (i.e. can probably grow a good 10 mm, in small increments, over several years) as I will more than likely only go for surgery (my gut instinct this week), and hearing preservation rates are quite poor with surgery - so I am definitely better off doing nothing with an asymptomatic tumor than having surgery.
good luck - I will follow your decision with interest.
Ann