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Figure 9c. Mild chronic pancreatitis. (a) Presecretin MR image shows no abnormality of the main pancreatic duct (arrow). (b) MR image obtained 5 minutes after secretin injection shows a normal main pancreatic duct (arrow) and dilatation of several side branches (arrowhead), findings consistent with mild (grade 3) chronic pancreatitis. (c) ERCP image shows dilatation of more than three side branches (arrowheads) without irregularity in the main duct (arrow), findings that confirm mild chronic pancreatitis.