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Small lymphoid proliferations in extranodal locations.

Dinesh S Rao1, Jonathan W Said

  • 1Center for Health Sciences, UCLA, Department of Pathology and Laboratory Medicine, 10833 Le Conte Ave, Los Angeles, CA 90095, USA.

Archives of Pathology & Laboratory Medicine
|May 23, 2007
PubMed
Summary
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Diagnosing extranodal low-grade lymphomas requires recognizing specific histologic features and utilizing ancillary studies. Accurate identification aids differentiation from inflammatory conditions.

Area of Science:

  • Hematopathology
  • Oncology

Background:

  • Low-grade non-Hodgkin lymphomas commonly affect extranodal sites like the GI tract, skin, and lung.
  • Distinguishing these lymphomas from inflammatory or infectious conditions necessitates understanding specific histologic characteristics and employing ancillary techniques.

Purpose of the Study:

  • To detail key features and diagnostic clues for extranodal low-grade T-cell and B-cell lymphomas.
  • To highlight histologic, cytologic, and ancillary diagnostic study findings (flow cytometry, immunohistochemistry, molecular, cytogenetics).

Main Methods:

  • Review of published literature.
  • Analysis of personal experience from a specialized hematopathology practice.

Main Results:

  • Key features of small lymphocytic lymphoma, follicular lymphoma, mantle cell lymphoma, extranodal marginal zone B-cell lymphomas (MALT lymphoma), and hairy cell leukemia are described.

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  • Integration of ancillary studies is crucial for accurate subtyping.

    • Conclusions:

    • Accurate identification of extranodal low-grade lymphomas is essential for appropriate patient management.
    • Distinguishing lymphomas from reactive processes relies on recognizing specific entities and utilizing ancillary diagnostic studies.