Abstract
Mucosa-associated lymphoid tissue (MALT) lymphomas most commonly occur in the stomach and rarely in the duodenum. Gastric MALT lymphoma is usually associated with <i>Helicobacter pylori</i> (<i>H. pylori</i>) infection that may be cured by eradication. However, duodenal MALT lymphoma is not associated with <i>H. pylori</i> infection. Moreover, the pathophysiology and treatment methods for duodenal MALT lymphoma have not yet been established because the disease is rare. Here, we report a case of duodenal MALT lymphoma. A 58-year-old man was treated for a refractory duodenal ulcer. Based on repeated biopsy, a diagnosis of MALT lymphoma was made. The patient achieved complete remission after chemotherapy and was followed up without recurrence for three years.
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