Chapter 9 The gastrointestinal system/Fig 9.31.jpg

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Gastric B-cell lymphoma of MALT origin (marginal zone lymphoma). (A) The characteristic lymphoepithelial lesion shows atypical lymphoid cells invading a gastric gland. The extent of this process is emphasized in (B), where the glands are highlighted by an immunohistochemical demonstration of cytokeratin.