I lived (as many did) thru the episode that was Ryan Leaf for the San Diego Chargers. He is a jerk. Glad to hear it was a benign tumor. Do not wish him that.
He was a pitiful quarterback but the Chargers were warned about his behavior. He took them for a ride.
I know nothing about sports.
I do know that a properly positioned benign tumor can result in death. The brain stem is one area that comes to mind. Heart and liver also.
It is a miracle that today there are those capable of doing such procedure. Years back, we just watched these people waste away and die in less than normal manner.