If the report says that he needs more treatment and it's from the neurosurgery team, then you've done the right thing in finding out early. Left too late could make the prognosis even worse.
A friend of mine wouldn't visit the doctor with his frequent headaches. He had a brain haemorrhage and died at the age of 32. That was in 1986 and I still miss him.
Don't feel bad, the doctor is telling you the risks to prepare you (and cover themselves), in case anything DID go wrong, but neurosurgeons, with todays technology can work miracles.
Keep your chin up!