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The aim of this study was to compare the concordance of the Balthazar grade and the revised Atlanta classification and then establish a modified radiological scoring system that would predict 3 degrees of severity of acute pancreatitis (AP) based on the latest Atlanta classification.A retrospective study enrolling pediatric inpatients with AP who had completed computed tomography was conducted between January 2006 and March 2018. The concordance of the 2 radiological scoring systems was assessed with κ statistic.The Balthazar grade was unable to accurately predict the severity of AP compared with the revised Atlanta classification. However, a modified Balthazar grading system defining patents with Balthazar grades A to C as mild, grade D as moderately, and grade E as severe presented perfect agreement with the revised Atlanta classification across the enrolled population (κ, 0.85; 95% confidence interval, 0.73–0.97). The concordance of the modified Balthazar score and the revised Atlanta classification remained a perfect degree of agreement across repeated tests in 90 random samples (κ, 0.85; 95% confidence interval, 0.85–0.85).The modified Balthazar grade demonstrated perfect agreement with the latest Atlanta classification for AP severity scoring. As such, the modified Balthazar grade can be used to predict 3 degrees of severity of AP.