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Sixty-seven-year-old man with an mr-T3N0 rectal adenocarcinoma 9.5 cm from the anal verge. Pretreatment rectal MRI (A, B) before NCRT. The EMD was 9.7 mm (A), the TM was 21.7 mm (B), and the calculated PTI was 44.7%. The rectal cancer had regressed after NCRT. The postoperative staging confirmed by pathology was T0N0, and the tumor response was pCR.
