 The purpose of this study was to assess the validity of the Pediatric Emergency Care Applied Research Network, PICCARN, rule in determining the necessity of computed tomography, CT, scans for children under two years old with minor head injuries. The results showed that the PICCARN rule is a reliable tool for identifying children at risk of having serious traumatic brain injuries, TBI. It has a high sensitivity, 100% negative predictive value, 100% and positive predictive value, 89.5% for detecting children with TBI. Additionally, it has a high specificity, 91.7% for identifying children with abnormal CT findings. This study suggests that the PICCARN rule can be used as a reliable tool to help physicians decide whether or not to order a CT scan for children with minor head injuries. This article was authored by Kwon Yeol-young, Sung Bae-kon, Jay Sung Lee and others.