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T Cell Activation and Clonal Selection01:22

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T cells are integral to our adaptive immune system, recognizing and effectively responding to foreign antigens. T cell activation and clonal selection are pivotal in orchestrating this immune response. This article elucidates these mechanisms, detailing the roles of cluster of differentiation (CD) markers, major histocompatibility complex (MHC) molecules, costimulatory signals, and the process of clonal selection.
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The T and B lymphocytes of the adaptive immune system develop from common lymphoid progenitor cells in the bone marrow. These progenitors give rise to precursors that eventually develop into both T and B lymphocytes. As these precursors mature, they gain the ability to detect and respond to foreign antigens in the body, a process known as immunocompetence. Additionally, these precursors acquire self-tolerance, a process that ensures they do not react to self-antigens. This intricate system...
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Follicular T-cell lymphoma.

Mona Lisa1, Pranab Kumar Verma2, Nishi2

  • 1Department of Pathology, AIIMS, Deoghar, Jharkhand, India.

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|December 17, 2021
PubMed
Summary

Follicular T-cell lymphoma is a rare neoplasm characterized by a follicular growth pattern in lymph nodes. Accurate diagnosis relies on immunohistochemistry to identify follicular helper T-cells, distinguishing it from other lymphomas.

Keywords:
Follicularhelper T-celllymphoma

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Area of Science:

  • Hematology
  • Oncology
  • Immunopathology

Background:

  • Follicular T-cell lymphoma (FTCL) is a rare lymphoid neoplasm characterized by a distinctive follicular growth pattern within lymph nodes.
  • Its true incidence remains largely unknown due to its recent description and rarity.
  • Diagnosis relies on identifying neoplastic follicular helper T-cells.

Observation:

  • This report details a specific case of the follicular variant of peripheral T-cell lymphoma.
  • The initial fine-needle aspiration diagnosis was Hodgkin lymphoma.
  • Subsequent analysis using hematoxylin and eosin staining suggested follicular lymphoma.

Findings:

  • Immunohistochemistry is crucial for confirming the follicular helper T-cell origin of the neoplasm.
  • The case highlights potential diagnostic challenges and misclassifications.
  • Accurate identification of FTCL is essential for appropriate patient management.

Implications:

  • This case underscores the importance of specialized diagnostic techniques, particularly immunohistochemistry, in differentiating rare lymphomas.
  • Improved diagnostic accuracy for follicular T-cell lymphoma can lead to better treatment strategies.
  • Further research into the incidence and characteristics of FTCL is warranted.