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Related Concept Videos

Cells of the Adaptive Immune Response01:23

Cells of the Adaptive Immune Response

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...
B Cell Activation and Differentiation01:24

B Cell Activation and Differentiation

The adaptive immune response, a sophisticated defense mechanism, relies on the activation and differentiation of B lymphocytes, or B cells. These processes enable our bodies to mount a tailored response against specific pathogens such as bacteria, free virus particles, toxins, and parasites.
When naive B cells encounter a specific antigen that can bind to the B cell receptor (BCR) on their surface, they undergo sensitization to respond to the antigen's presence. Sensitization begins with...

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Related Experiment Video

Updated: Jun 27, 2026

In Vitro Differentiation Model of Human Normal Memory B Cells to Long-lived Plasma Cells
10:26

In Vitro Differentiation Model of Human Normal Memory B Cells to Long-lived Plasma Cells

Published on: January 20, 2019

Plasma-cell-predominant B-cell pseudolymphoma.

Stephen J Nervi1, R A Schwartz

  • 1Department of Dermatology, New York University, USA.

Dermatology Online Journal
|December 9, 2008
PubMed
Summary

A rare case of cutaneous pseudolymphoma presented as facial masses in a woman without foreign travel history. This nonmalignant B cell proliferation highlights diagnostic challenges and potential treatment resistance in idiopathic cases.

Area of Science:

  • Dermatology
  • Pathology
  • Immunology

Background:

  • Cutaneous pseudolymphoma is a nonmalignant skin condition involving lymphocyte accumulation.
  • It can be triggered by various stimuli and classified based on etiology.
  • Diagnosis requires differentiating from cutaneous lymphomas.

Observation:

  • A 46-year-old woman presented with pruritic, ulcerating facial masses.
  • Symptoms persisted for months, with no history of foreign travel.
  • Clinical and histopathologic examination suggested a plasma cell-predominant B cell pseudolymphoma.

Findings:

  • Extensive special stains failed to identify an etiologic organism.
  • The presentation was consistent with idiopathic cutaneous pseudolymphoma.

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  • This condition involves benign skin lymphocyte proliferation.
  • Implications:

    • Idiopathic cutaneous pseudolymphoma can be challenging to treat.
    • Accurate diagnosis is crucial to avoid misclassification as lymphoma.
    • Further research may elucidate causative factors and improve therapeutic strategies.