Study Reveals Youth Football Changes Nerve Fibers in Brain

MRI scans show that repetitive blows to the head result in brain changes among youth football players, according to a new study being presented at the annual meeting of the Radiological Society of North America (RSNA).   This occurs even if hits to the head are subconcussive—or below the threshold of a concussion—and, therefore, don't cause the symptoms of a concussion, according to the study.   "The years from age 9 to 12 are very important when it comes to brain development," sai