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Fig. 1A —75-year-old man with poorly differentiated rectal adenocarcinoma (arrows). Preoperative MRI T category was T2 (smooth outer tumor border within rectal wall and no invasion into fat surrounding rectum), and preoperative 3-T MRI showed tumor had invaded anal sphincter. MRI findings were confirmed at surgery, and patient underwent abdominoperineal resection. Coronal T2-weighted fast-recovery fast spin-echo image.