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Fig. 4A. —57-year-old man with an ampullary carcinoma (group I). Kinematic MR cholangiopancreatographic images show alternate contraction (A) and relaxation (B) of sphincteric segment. However, degree of relaxation of sphincteric segment seems to be incomplete. Diameter of relaxed sphincteric segment was found to abruptly become more narrow than adjacent common bile duct (arrow, B).