121 Predicting response to chemoradiotherapy in rectal cancer via visual morphologic assessment and staging on baseline MRI 7 Figure 1 Instructions provided to the study readers to assign a 4-point risk score based on the presence/absence of 4 key high-risk features: obvious MRF invasion, high-risk T-stage (bulky/irregular, T3c-4), obvious node-positive disease and obvious EMVI. Readers were instructed to only select yes if they were confident that a respective worrisome feature was present. When in doubt, readers were instructed to select ‘no’.
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