The 2019 WHO classification of pancreatic ductal adenocarcinoma precursors recognizes three main types. Intraductal papillary mucinous neoplasm (IPMN) of the main duct type carries the highest malignancy risk. Compared to mucinous cystic neoplasm (MCN), IPMN has a defining distinguishing feature:

• A Presence of ovarian-type stroma
• B Communication with the pancreatic ductal system ✓
• C Exclusively involving the tail and body of pancreas
• D Only occurring in postmenopausal women

Explanation

The single most important feature distinguishing IPMN from MCN is the communication (connection) of IPMN with the main pancreatic duct or branch ducts, producing mucin that may be expressed through a patulous ampulla of Vater — a classic endoscopic sign. MCN (mucinous cystic neoplasm) does NOT communicate with the ductal system and characteristically has ovarian-type subepithelial stroma. MCN occurs almost exclusively in women (95%+), typically in the body/tail, while IPMN occurs in both sexes and can involve the head. This distinction has surgical management implications.

Reference: Robbins & Cotran Pathologic Basis of Disease, 10th ed.

High-yield for: NEET PGINI-CETNExTFMGEUSMLEPLABMRCP

Written and medically reviewed by the StethoPrep medical team.