Abstract
The International Consensus Guidelines for the Management of Intraductal Papillary Mucinous Neoplasms (IPMN) and Mucinous Cystic Neoplasms have given us a classification scheme, diagnostic criteria, and treatment strategies of the IPMN at present. However, there remain several problems to be clarified further. These include, for instance : 1) How should we manage the mixed type of IPMN, as the branch duct type or main duct type? 2) Should an adenoma of IPMN be resected or followed up? 3) Is the definitive preoperative diagnosis of malignancy possible or not? 4) How can we determine the proper site of resection of main duct or mixed type IPMN? Japanese investigators are expected to solve these problems by meticulous and careful studies of their patients.
