gastrinoma

noun

gas·​tri·​no·​ma ˌgas-trə-ˈnō-mə 

plural gastrinomas also gastrinomata -mət-ə 

: 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