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Figure 3b: Perceptual error: cancer visualized en face and contour defect. (a) Anteroposterior radiograph of cecum shows contour defect (arrows) due to 3.0-cm cecal adenocarcinoma, which was not recognized at initial examination. (b) Slight left posterior oblique radiograph of cecum shows 3.0-cm adenocarcinoma (arrows), which is difficult to recognize en face.
