How is mucosa-associated lymphoid tissue (MALT) lymphoma characterized in the histologic findings of NHL/B-cell lymphoma?

Updated: Feb 23, 2021
  • Author: Mohammad Muhsin Chisti, MD, FACP; Chief Editor: Emmanuel C Besa, MD  more...
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Answer

Mucosa-associated lymphoid tissue (MALT) lymphoma is an extranodal lymphoma composed of morphologically heterogeneous small B cells, including marginal zone (centrocytelike) cells, small lymphocytes, and scattered immunoblast and centroblastlike cells.

The lymphoma cells infiltrate around reactive B-cell follicles, external to a preserved follicle mantle, in a marginal zone distribution and spread out to form larger confluent areas that eventually overrun some or most of the follicles. There is plasma cell differentiation in a proportion of the cases. In epithelial tissues, the neoplastic cells typically infiltrate the epithelium, forming lymphoepithelial lesions.


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