Re: Ivo G. Schoots, Jelle O. Barentsz, Leonardo K. Bittencourt, et al. PI-RADS Committee Position on MRI Without Contrast Medium in Biopsy-naive Men with Suspected Prostate Cancer: Narrative Review. Am J Roentgenol 2021;216:3-19 PI-RADS v2.1 and Future Direction Towards Prostate Biparametric Magnetic Resonance Imaging