Zollinger-Ellison Syndrome. A group of symptoms that occur when a tumor called a gastrinoma forms. The tumor, which can be cancerous, releases large amounts of the hormone called gastrin. The gastrin causes too much acid in the duodenum, resulting in ulcers, bleeding, and perforation.PubMed Health Glossary.ollinger-Ellison Syndrome. A group of symptoms that occur when a tumor called a gastrinoma forms. The tumor, which can be cancerous, releases large amounts of the hormone called gastrin. The gastrin causes too much acid in the duodenum, resulting in ulcers, bleeding, and perforation. PubMed Health Glossary.
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