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Related Concept Videos

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Lymphoid cells and tissues are integral to the immune system, which is crucial in maintaining our body's defense against harmful pathogens. They form the building blocks of lymphoid organs, which include the spleen, thymus, and lymph nodes.
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Primary lymphoid organs are pivotal in the formation, development, and maturation of lymphocytes, the white blood cells that serve as the backbone of our immune system. This crucial function underscores their fundamental role in maintaining our overall health and immunity. The two primary lymphoid organs of prime importance are the red bone marrow and the thymus.
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Related Experiment Video

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Multiplexed Fluorescent Immunohistochemical Staining, Imaging, and Analysis in Histological Samples of Lymphoma
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Primary mediastinal lymphomas, their morphological features and comparative evaluation.

Riti Aggarwal1, Seema Rao1, Shashi Dhawan1

  • 1Department of Pathology, Sir Ganga Ram Hospital, New Delhi, India.

Lung India : Official Organ of Indian Chest Society
|February 2, 2017
PubMed
Summary
This summary is machine-generated.

Differentiating primary mediastinal B-cell lymphoma (PMBCL) and Hodgkin's lymphoma (HL) relies on key morphological and immunohistochemistry (IHC) features. Careful evaluation of marker expression patterns is crucial for accurate diagnosis of these mediastinal lymphomas.

Keywords:
CD20CD30immunohistochemistrylymphomamediastinummorphologyprimary mediastinal B-cell lymphoma

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Area of Science:

  • Oncology
  • Pathology
  • Hematology

Background:

  • Primary mediastinal lymphomas are rare, with Hodgkin's lymphoma (HL), primary mediastinal B-cell lymphoma (PMBCL), and T-lymphoblastic lymphoma being most common.
  • Accurate diagnosis and subcategorization depend heavily on morphological and immunohistochemistry (IHC) features.

Purpose of the Study:

  • To analyze the morphological and histological characteristics of 32 primary mediastinal lymphoma cases.
  • To compare the morphological and IHC features of PMBCL against HL and systemic diffuse large B-cell lymphoma.

Main Methods:

  • Review of 32 primary mediastinal lymphoma cases diagnosed over five years.
  • Morphological assessment and IHC analysis, including CD20, CD30, CD3, CD15, leukocyte common antigen, and fascin.
  • Comparative analysis of PMBCL versus HL and systemic diffuse large B-cell lymphoma.

Main Results:

  • Distinct morphological clues: clear cells and compartmentalizing fibrosis in PMBCL; Reed-Sternberg cells and inflammatory background in HL.
  • PMBCL typically shows diffuse, strong CD20 positivity and focal/patchy CD30 expression.
  • HL typically exhibits diffuse, strong CD30 positivity and focal/patchy CD20 expression.

Conclusions:

  • Morphological assessment and IHC are critical for differentiating PMBCL and HL.
  • Beyond mere positivity, the pattern, intensity, and percentage of IHC marker expression are vital for diagnosis.
  • CD15, leukocyte common antigen, and fascin aid in diagnosing challenging cases of PMBCL and HL.