Lymphoma and plasma cell neoplasms
B cell lymphoma subtypes
Marginal zone B cell lymphoma - General

Author: Nikhil Sangle, M.D. (see Authors page)

Revised: 3 April 2017, last major update March 2011

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PubMed Search: marginal zone B cell lymphoma

Cite this page: Marginal zone B cell lymphoma - General. PathologyOutlines.com website. http://www.pathologyoutlines.com/topic/lymphomamzlgeneral.html. Accessed August 20th, 2017.
Definition / general
Etiology
  • Marginal zone lymphomas are thought to derive from cells in the nodal or splenic marginal zone, perhaps from B memory cells that are post germinal center and IgM+, IgD-, based on a low sequence homology between their IgH variable genes and germline genes
Clinical features
Microscopic (histologic) description
  • Perifollicular proliferation of centrocyte or monocyte-like, irregular small B cells, mixed with larger centroblast or immunoblast-like cells; may have plasmacytoid features
  • The clonal B cells infiltrate the marginal zone of reactive follicles, and extend into the interfollicular region
  • In epithelial lined tissues, the clonal B cells infiltrate the epithelial cells to form lymphoepithelial lesions
  • Cells resemble monocytoid B cells in lymph node sinuses in toxoplasmosis, cat-scratch disease, AIDS, infectious mononucleosis, autoimmune disorders and other reactive disorders
Stains
  • Plasmacytoid cells may be negative for B cell markers but are strongly immunoreactive for kappa or lambda, and carry a serum paraprotein (M-component) in peripheral blood