MUC5AC and pancreatic intraductal papillary-mucinous neoplasm: The hyperplastic epithelium of these lesions is variably positive for gastric-type mucins, such as MUC5AC and MUC6, resembling pancreatic intraductal papillary mucinous neoplasm of the branch duct type [118,119], and the degree of atypia ranges from low- to high-grade.