A 68-year-old man presents with recurrent epigastric pain and recent-onset diabetes. Contrast-enhanced CT abdomen shows the lesion marked **A** in the diagram — diffuse dilatation of the main pancreatic duct to 9 mm with multiple small cystic outpouchings communicating with the duct, no surrounding inflammation, and a bulging papilla. Serum amylase is normal; CA 19-9 is mildly elevated. Based on the imaging findings and clinical presentation, which of the following is the most appropriate next step in management?
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