Advance in study on diagnosis of pancreatic cystic tumors on CT/MRI imaging

Pancreatic cystic tumors (PCN) refer to cystic tumor lesions originating from the epithelium and/or interstitial tissue of the pancreatic duct. PCN can be roughly divided into mucinous tumors and non-mucinous tumors. The former mainly includes intraductal papillary mucinous neoplasms (IPMN) and mucinous cystic neoplasms (MCN), while the latter mainly includes serous cystic neoplasms (SCN) and solid-pseudopapillary neoplasms (SPN) and cystic neuroendocrine neoplasms (cNET). Different types of PCNs have differentiated biological behaviors, and some types of PCNs have a risk of developing a malignancy. Preoperative identification of PCN malignancy on CT and MRI imaging is of great significance. Malignant indications for MCN are surgical indications， such as a diameter greater than or equal to 4 cm. IPMN accounts for 22% of PCN, and the risk of malignancy in main pancreatic duct type and mixed type IPMN can reach up to 70.9% and 76.5%, while the risk of malignancy in branch pancreatic duct type IPMN is 2.8%-10.7%