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Fig. 2B. —65-year-old man with polypoid rectal carcinoma extending beyond proper muscle layer. Transverse T2-weighted fast spin-echo MR images (TR/TE, 4,300/75) were obtained before (A) and after (B) rectal distention. Irregular spiculation and nodular bulging were noted on anterior margin of mass (arrow, A) on nondistended image. All reviewers indicated that tumor penetrated outer wall of rectum. After rectal filling with water, mass separated from anterior wall of rectum, and its outline was clearly defined (B). All reviewers correctly identified mass confined to rectal wall. Note that rectal layers were also better identified on distended image (B).