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Primary Lymphoid Organs01:16

Primary Lymphoid Organs

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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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Secondary organs, including lymph nodes, the spleen, and mucosa-associated lymphoid tissue (MALT), work harmoniously to protect us from disease and infection.
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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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Primary central nervous system lymphoma-current standards and recent developments.

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Tumor Engraftment in a Xenograft Mouse Model of Human Mantle Cell Lymphoma
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Primary central nervous system lymphoma.

Myrthe E de Koning1, Jurrit J Hof2, Casper Jansen3

  • 1Department of Neurology, Medisch Spectrum Twente, Enschede, The Netherlands. me.dekoning@mst.nl.

Journal of Neurology
|December 19, 2023
PubMed
Summary

Primary central nervous system lymphoma (PCNSL) is a rare brain cancer. Prompt diagnosis and treatment, often involving high-dose methotrexate and autologous stem cell transplantation (ASCT), are crucial for improving survival rates.

Keywords:
CNS lymphomaHigh-dose methotrexateNeuro-oncologyWhole brain radiotherapy

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Area of Science:

  • Neurology
  • Oncology
  • Radiology

Background:

  • Primary central nervous system lymphoma (PCNSL) is a rare non-Hodgkin lymphoma (NHL) affecting the brain, spinal cord, cerebrospinal fluid, or eyes.
  • PCNSL incidence is increasing, with a 30% 5-year survival rate if treated promptly.
  • Dexamethasone can hinder PCNSL diagnosis.

Purpose of the Study:

  • To summarize the key aspects of PCNSL diagnosis and treatment.
  • To highlight the typical MRI findings associated with PCNSL.
  • To discuss current treatment strategies, including the shift towards autologous stem cell transplantation (ASCT).

Main Methods:

  • Review of typical MRI characteristics of PCNSL, including T2-hypointense lesions and gadolinium enhancement.
  • Description of standard induction chemotherapy with high-dose methotrexate.
  • Outline of consolidation treatment options: whole brain radiotherapy (WBRT) versus ASCT.

Main Results:

  • Typical MRI findings include solitary or multiple T2-hypointense, homogeneous gadolinium-enhancing lesions with restricted diffusion.
  • High-dose methotrexate is the cornerstone of induction chemotherapy.
  • ASCT is increasingly preferred over WBRT due to reduced cognitive side effects.

Conclusions:

  • Timely diagnosis and treatment are essential for improving PCNSL outcomes.
  • ASCT is emerging as a preferred consolidation strategy over WBRT for PCNSL.
  • Understanding PCNSL's MRI features and treatment evolution is critical for clinicians.