Wow,Bruce. Sorry to here that you are going through this.
We obviously don't know each other, but I'm hoping the following will give you some comfort, hope and optimism.
My wife has had to go through two non-cancerous brain tumor surgeries. The first was supposed to get rid of the tumor, but the surgeon didn't feel comfortable in removing a portion that was in a "delicate area" of the brain. But he got most of it.
Once the surgery was over, he said that it was such a slow-growing tumor that she may not have any issues with it in her lifetime. It came back in full force 3 years later.
Here's where it gets good. Due to some technological breakthroughs, they were able to remove the tumor in its entirety the second time around. There were no any adverse effects to her brain. No problems with motor skills, memory or speech. She simply woke up in the recovery room and told me she loved me more than ever... which only means she was just as crazy as she was before the operation. :)
It's been 8 years since the second operation and all is well.
Wishing you success, and we'll be keeping a look out for when you come back.
Godspeed,
Cam