If a brain tumor is benign, then the prognosis is pretty good, assuming the surgeons can remove the whole tumor. This has become easier (if anything in brain surgery can be said to be easy) with laser and gamma knife procedures. Surgeons can just "burn" away the tumor a millimeter at a time.
A former co-worker had a brain tumor last year. His surgeons didn't know until the pathologist looked at the specimen whether it was cancer or not. Thank the Lord, it was not. So, after a recovery period, he's back at work and doing well. He said he feels better because he doesn't have the fatigue and headaches he used to have before the surgery.