Sixty-three-year-old man with cT. 3a. N. 0 rectal adenocarcinoma 5 cm from the anal verge. Baseline thin section T2-weighted pelvic MRI(a) before CRT revealed posterior rectal lesion. The EMD was 4.0 mm. b. axial thin section T2-WI after CRT. Pathological examination of the resection specimen revealed no residual tumor = pCR (pathological complete response) and TRG 0 (tumor regression grade).