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Multiple blows to the head, whether in football, soccer, boxing, hockey, or other activity, can sometimes cause permanent brain damage accompanied by changes in personality, memory, and thinking. Chronic traumatic encephalopathy, or CTE, is the medical term for the damage caused by these repeated concussions. Standard MRIs cannot detect it, so a diagnosis of CTE usually cannot be made with certainty until after a person has died. Only on autopsy can a pathologist see the damaged brain tissue.
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Rahul Jandial (Life Lessons From A Brain Surgeon: Practical Strategies for Peak Health and Performance)