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The diagnostic rate of intraductal papillary mucinous neoplasms (IPMNs) has been increased as the improvement of imaging and endoscopic techniques.All main duct type and mixed variant IPMNs should be resected as long as the patient is a good surgical candidate with reasonable life expectancy.Evaluation of resection margin ( especially circumferential margins) is very important to prevent the recurrence of IPMNs,and intraoperative pancreatoscopy plays an important role in determining the appropriate size for pancreatic resection.In this article,the experience in the treatment of 1 patient with IPMNs by precise pancreatectomy guided by endoscopy-assisted intraoperative pancreatic duct inspection was introducted.