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Fig. 3B. —59-year-old woman with ulcerative carcinoma extending beyond
proper muscle layer. Transverse T2-weighted fast spin-echo MR images (TR/TE,
4,000/84) were obtained before (A) and after (B) rectal
distention. Nodular bulging outer contour of rectum (arrow, A)
was noted on anterolateral aspect of rectum. Three reviewers indicated that
tumor penetrated outer wall of rectum. After rectal distention, mass
(arrow, B) is clearly identified and outer muscular layer is
well delineated with no evidence of disruption. Three reviewers correctly
identified mass confined to rectal wall.
