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a Primary Duodenal MALTLymphoma

Primary duodenal MALTlymphoma(MALToma) is a very rare neoplasm arising from the mucosa-associated lymphoid tissue of the duodenum.Wereport a 55-year-old womanwith MALTomalocated in the descending duodenum and accompanying Helicobacterpylori infection of the stomach. Weperformed operative resection due to involvement of the papilla of Vater and submucosal tumor infiltration. Despite wide mucosal spreading, postoperative examination revealed only a small amount of MALToma cells infiltrating into the submucosa. No invasion into the adjacent structure or metastasis to regional lymphnodes was confirmed, suggesting the disease could have been controlled by eradication of Helicobacter pylori. (Internal Medicine 38: 957-961, 1999)