Interobserver agreement of radiologists assessing the response of rectal cancers to preoperative chemoradiation using the MRI tumour regression grading (mrTRG)

•Inter-observer agreement of radiologists was assessed using MRI rectal tumour regression scale. •Kappa agreement had a median value of 0.57 (95% CI: 0.37–0.77) indicating an overall good agreement. •In 65.9% and 90% of cases the radiologists were able to correctly highlight good and poor responders respectively. •With minimal training good agreement and differentiation between good and intermediate/poor responders can be achieved. •Focus should...