Pancreatic cystic lesions are increasingly identified on routine imaging.One specific lesion,known as intraductal papillary mucinous neoplasm(IPMN),is a mucinous,pancreatic lesion characterized by papillary cells projecting from the pancreatic ductal epithelium.The finding of mucin extruding from the ampulla is essentially pathognomonic for diagnosing these lesions.IPMNs are of particular interest due to their malignant potential.Lesions range from benign,adenomatous growths to highgrade dysplasia and invasive cancer.These mucinous lesions therefore require immediate attention to determine the probability of malignancy and whether observation or resection is the best management choice.Unresected lesions need long-term surveillance monitoring for malignant transformation.The accurate diagnosis of these lesions is particularly challenging due to the substantial similarities in morphology of pancreatic cystic lesions and limitations in current imaging technologies.Endoscopic evaluation of these lesions provides additional imaging,molecular,and histologic data to aid in the identification of IPMN and to determine treatment course.The aim of this article is to focus on the diagnostic and therapeutic endoscopic approaches to IPMN. Pancreatic cystic lesions are identified on routine imaging. One specific lesion, known as intraductal papillary mucinous neoplasm (IPMN), is a mucinous, pancreatic lesion characterized by papillary cells projecting from the pancreatic ductal epithelium. The finding of mucin extruding from the ampulla is essentially pathognomonic for diagnosing these lesions. IPMNs are of particular interest due to their malignant potential. Lesions range from benign, adenomatous growths to highgrade dysplasia and invasive cancer. These mucinous lesions therefore require immediate attention to determine the probability of malignancy and whether observation or resection is the best management choice. Unresected lesions need long-term surveillance monitoring for malignant transformation. The accurate diagnosis of these lesions is particularly probable to the substantial similarities in morphology of pancreatic cystic lesions and limitations in current imaging technologies. Endoscopic evaluation of these lesions provides additional imaging, molecular, and histologic data to aid in the identification of IPMN and determined treatment course. Aims of this article is to focus on the diagnostic and therapeutic endoscopic approaches to IPMN.