Intraductal papillary mucinous neoplasm (IPMN) is a type of tumor (neoplasm) that grows within the pancreatic ducts (intraductal) and is characterized by the production of thick fluid by the tumor cells (mucinous). Intraductal papillary mucinous neoplasms are important because if they are left untreated some of them progress to invasive cancer (transform from a benign tumor to a malignant tumor). Just as colon polyps can develop into colon cancer if left untreated, so too do some intraductal papillary mucinous neoplasms progress into an invasive pancreatic cancer...