The brain scans of high school football and hockey players showed subtle injury - even if they did not suffer a concussion - after taking routine hits to the head during the normal course of play, according to a University of Rochester Medical Center study. The research, reported online in the journal Magnetic Resonance Imaging, is preliminary, involving a small sample of athletes, but nonetheless raises powerful questions about the consequences of the mildest head injury among youths with developing brains, said lead author Jeffrey Bazarian, M.D., M.P.H...

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