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Fig. 1A 52-year-old man with T1 rectal cancer (pT1) who underwent
anterior resection with total mesorectal excision. Axial MR image from
T2-weighted turbo spin-echo acquisition shows tumor (arrows)
extending into muscular layer with loss of interface between submucosa and
muscle layer. All three observers interpreted lesion as mT2, overstaging
it.