MUC5AC and pancreatic intraductal papillary-mucinous neoplasm: An intraductal papillary mucinous neoplasm (IPMN) in the pancreas is a cystic tumor with unique histopathologic features, including massive dilatation of the pancreatic duct, mucin hypersecretion, and papillary epithelial projections into the pancreatic duct tributaries1–3.