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Fig. 7B —78-year-old woman with bulky tumor. Tumor-narrowing lumen
(arrow) makes accurate measurement of single wall thickness difficult
on MRI (A). Tumor, however, does not invade muscularis
(arrowhead). Corresponding histology (B) confirms extensive
intraluminal tumor-narrowing lumen (arrow) and normal surrounding
muscularis propria (arrowhead). Five of 20 overestimations of tumor
thickness were because of this difficulty.
