| Summary: | We report the regression of coexisting mucosa-associated lymphoid tissue (MALT) lymphomas in the duodenal bulb and gastric corpus brought about by Helicobacter pylori eradication. During an endoscopic examination, multiple polyps in the duodenal bulb were observed in a 62-year-old woman. The pathology of the duodenal polyps was low-grade B-cell MALT lymphoma. Gastric MALT lymphoma was also detected in biopsies of rough mucosa from the gastric corpus. Southern blot analysis showed rearranged bands of DNA immunoglobulin heavy chain J portion (IgH-J) in both lesions, but the positions of these bands were different in the two lesions. H. pylori was recognized in the gastric mucosa by positive serum H. pylori antibody and urease tests, while bacterial bodies were not found in the duodenal bulb. With 1 year after the successful eradication of H. pylori, both the lesions, that in the duodenal bulb and that in the gastric corpus, had disappeared. Furthermore, positive rearrangement of IgH-J was not found at either of the lesion sites. In May 2000, 3 years after the treatment, endoscopic surveillance failed to find any recurrence of these malignant lymphomas.
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