This review examines the long-standing finding that ADHD is a common sequela of pediatric traumatic brain injury (PTBI) in light of the current conceptualization of ADHD as a dimensional, neuropsychologically heterogeneous disorder. The review contends that this conceptualization established the basis for concluding that frequently occurring symptoms caused by PTBI, such as slow processing speed, emotional dysregulation and disinhibition, are indicative of ADHD. Consequently, it concludes that ADHD following PTBI is even more common than the 30% rate the current literature suggests. It provides recommendations for the assessment and treatment of ADHD associated with PTBI.