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Fig. 4B. —28-year-old woman with ulcerative rectal carcinoma
penetrating outer wall. Transverse T2-weighted fast spin-echo MR images
(TR/TE, 4,200/75) were obtained before (A) and after (B) rectal
distention. Hypointense layer (arrow, A) was seen on posterior
aspect of tumor on nondistended image. All reviewers falsely interpreted that
tumor did not penetrate outer rectal wall. Rectal distention image shows that
outer margin of tumor (arrow, B) extends to perirectal fat.
Three reviewers correctly indicated that mass penetrated outer wall of
rectum.
