The care of children with acute medical problems is evolving as knowledge of new conditions develops. In addition, technology also changes to provide solutions to optimize care. This issue of PCNA highlights the important populations, disease states, and technological advancements in pediatric emergency medicine. Although concussion and head injury are common occurrences for the practicing pediatrician, we now better understand how to evaluate and manage these children and to use CT scans appropriately. Pediatric offices need to be incorporated in any emergency plan for both acute emergencies...