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A, The main pancreatic duct (MPD) is focally involved by mucinous epithelium (arrows), whereas a large branch duct (*) is involved circumferentially. B, A greater magnification demonstrates focal involvement of MPD by the gastric-type epithelium of low- to intermediate-grade dysplasia. The arrows indicate pancreatic duct glands undermining the luminal mucinous epithelium and arrowheads, normal pancreatic epithelium without cytoplasmic mucin.
