gastrinoma

noun
gas·​tri·​no·​ma | \ˌgas-trə-ˈnō-mə \
plural gastrinomas also gastrinomata\ -​mət-​ə \

Medical Definition of gastrinoma 

: a tumor that often involves blood vessels, usually occurs in the pancreas or the wall of the duodenum, and produces excessive amounts of gastrin which stimulates gastric-acid secretion and consequent formation of ulcers especially in the duodenum and the jejunum — see zollinger-ellison syndrome

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