| Health / Medical Topics |
Preinvasive Neoplasm of the Ampullary Region
A premalignant neoplastic and dysplastic lesion that arises from the ampulla of Vater. It is characterized by the absence of invasion. This category includes intestinal-type adenomas, noninvasive papillary neoplasms of pancreatobiliary type, and flat intraepithelial neoplasia. (NCI Thesaurus)
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