CTE is a neurodegeneration, a brain disease that's progressive and characterized by a build-up of a protein called tau.
See all video interviews with Dr. Ann McKee.
Ann McKee, MD is the chief neuropathologist for the Framingham Heart Study and the Boston University-based Centenarian Study. She is also the chief neuropathologist for the Boston-based Veterans Administration Medical Centers and for the Sports Legacy Institute.
Produced by Noel Gunther and Brian King, BrainLine.