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Introduction to Gastritis and Peptic Ulcer Disease

By

Nimish Vakil

, MD, University of Wisconsin School of Medicine and Public Health

Last full review/revision Jun 2021| Content last modified Jun 2021
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Topic Resources

In Zollinger-Ellison syndrome Gastrinoma A gastrinoma is a tumor usually in the pancreas or duodenum (the first segment of the small intestine) that produces excessive levels of the hormone gastrin, which stimulates the stomach to... read more , a rare tumor that usually occurs in the duodenum, pancreas, or adjacent structures, produces a hormone called gastrin that causes the stomach to produce too much acid.

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Anorectal Fistula
An anorectal fistula is an abnormal channel from the anus or rectum to the skin, usually near the anus, but occasionally near another organ, such as the vagina. Anorectal fistulas are common among patients with each of the following medical conditions EXCEPT:
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