Duodenal Tube
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A peptic ulcer in the duodenum is a called a duodenal ulcer. It is a defect in the lining of the stomach in the first layer of the small intestine called the duodenum. The lining of the small intestines usually protects itself from any mucosal versus acid imbalances. If this balance breaks down the tissue becomes swollen and inflamed and causes ulcerative formations in the duodenum.