Interobserver Reproducibility of the PI-RADS Version 2 Lexicon: A Multicenter Study of Six Experienced Prostate Radiologists

Six experienced radiologists achieved moderate reproducibility for Prostate Imaging Reporting and Data System version 2 and neither required nor benefitted from a training session; agreement tended to be better in the peripheral zone than the transition zone, although it was weak for dynamic contrast–enhanced imaging in the peripheral zone.