I had the works: hydrocephalus and a 5cm AN. I had the shunt installed one month before the tumor resection; two weeks in the hospital for the shunt (which had to be done over the next day because it had become dislodged) and 3 weeks in for the main surgery (15.5 hours) under a surgical microscope—and they had to leave about half of it in!
I went into the surgery (this was 12 years ago) in great shape, trail running 5 miles a day through the woods and weight training, lean and mean. I came out of the ordeal with high blood pressure and high triglycerides that I have been managing through medication, diet and exercise since then.
The shunt is still in. I have constant double vision, equilibrium issues and am totally deaf on the left-side with shrill, unabating tinnitus. Other than that, I guess I'm doing okay.
I have an MRI every year. So far, so good. Great doctors at MGH in Boston! Rated best hospital on the planet.
If you're interested you can read through a transcript of my surgical report I posted 10 years ago here:
http://www.anausa.org/smf/index.php?topic=5342.msg48050#msg48050