As many as five brain regions may not be fully developed in children with attention-deficit/hyperactivity disorder (ADHD), according to a new imaging study. "The results from our study confirm that people with ADHD have differences in their brain structure and therefore suggest that ADHD is a disorder of the brain,” lead author Martine Hoogman, Ph.D., said in a news release. “We hope that this will help to reduce stigma that ADHD is ‘just a label’ for difficult children or caused by poor parenting."