All the NFL players I have examined pathologically, I have not seen one that did not have changes in their brain system with brain damage.

As a physician, I'm somewhat an advocate of patients. How come, before Mike Webster, no NFL player was told or knew that there was an intrinsic risk of brain damage from playing football?

Yes, the concept that blunt-force trauma of the head causes brain damage is a generally accepted principle of medicine. That is why I was so appalled by the NFL doctors who were denying my work.

A child who plays a game of football for one season without any documented concussion - several months after that season, if you subject his brain to sophisticated psychological testing and radiological testing, functional MRIs, there is evidence of brain damage.

I meet with retired football players. Some are well-dressed, some are well-spoken, but when you talk to them personally, they will admit to you that they are having problems. But they are managing their problems. They have impaired memory, they're having mood problems. They are being treated by their psychiatrists.

Chronic means long term. Traumatic means associated with trauma. Encephalopathy means a bad brain.