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Intraductal tubulopapillary neoplasms (ITPNs) are composed of tubulopapillary glands with high‐grade dysplasia in the pancreatic duct. Intraductal papillary mucinous neoplasms of the gastric type, pyloric gland variant (IPMN‐PGs) are composed of tubular glands mimicking pyloric glands with low‐grade dysplasia and were formerly called intraductal tubular adenomas. Because of their apparent common tubular...
Intraductal papillary mucinous neoplasm (IPMN) consists of four epithelial subtypes. Of those, pancreatobiliary and oncocytic types are recently recognized and relatively uncommon, and usually exhibit high‐grade dysplasia. The biological properties and molecular characteristics of these two types have not been well documented. The few molecular studies of the oncocytic type showed absence of KRAS...
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