Thanks so much, everyone, for your support. It means a lot to me.
Marianna, I took solace in your words of wisdom. If indeed this is a new tumor, at least it's been discovered before I've had any related symptoms and while it's still small. Dr. Chang told me today via email that the hypoglossal nerve is very resilient -- like the facial nerve -- and does not enervate readily after irradiation. So, I take that to mean that should CK become necessary, there's a good chance I won't lose any motor function with my tongue.
Thanks, Windy, for reminding me that this is not a done deal and perhaps nothing I should worry about. The real-life examples you gave of initial misdiagnoses give me hope that I'll get positive news in six months. Not that Dr. Chang or anyone else at Stanford has concluded firmly this is a tumor. Again, Dr. Chang said he's not 100% certain and advises a conservative "watch and wait" approach for now.
Eve and Donnalyn, thanks for reminding me to get a second opinion. I'm going to hold off for now, as nobody at Stanford is rushing me to the operating table. I'll probably follow up on your suggestion in January, after the holidays. Derald Brackmann has looked at my MRIs prior to my being treated; I expect he might extend his generosity once again if I ask him to. If he can't for some reason, I'll definitely contact Dr. Friedman (thanks for your referral, Donnalynn).
Many thanks to you all,
Tumbleweed