IPMN-B is subdivided on the basis of histology and mucin gene protein (MUC1, MUC2, and MUC5) expression into two to four subtypes; columnar and cuboidal types [19]; pancreatobiliary, intestinal, and/or gastric, and/or oncocytic types [2,6,20]. Here, MUC5AC is linked to pancreatic intraductal papillary-mucinous neoplasm.