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Figure 3b. (a) On a contrast-enhanced CT scan, the normal major duodenal papilla (arrow) can barely be distinguished from the surrounding duodenal mucosal folds, which was true in most cases in our study. (b) Contrast-enhanced CT scan shows the papilla (arrow) as a protuberance less than 10 mm in diameter with enhancement comparable to that of the adjacent duodenal mucosa, a finding that is seen less frequently than that in a. The targetlike enhancement of the normal papilla may be confused with a stone surrounded by low-attenuation bile.