A study reported in the June issue of the Journal of Neurosurgery Pediatrics reports that researchers examining neuroimaging studies obtained in children and adolescents with sports-related concussions found the images normal in 78% of cases despite confirmation of a concussion by a neurosurgeon.  The full study can be accessed at: http://thejns.org/doi/full/10.3171/2015.1.PEDS14510