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Related Concept Videos

Secondary Lymphoid Organs01:15

Secondary Lymphoid Organs

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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.
The spleen is a vital organ in the lymphatic system, nestled in the upper left side of the abdomen. It is composed of two primary regions: the red pulp and the white pulp, each having distinct functions. The red pulp performs a significant role in blood filtration. It efficiently purges the blood of old or damaged red blood cells and...
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Lymphoid Cells and Tissues01:18

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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.
Lymphoid cells consist of various types of immune system cells. These include B and T lymphocytes, which are responsible for producing antibodies and killing infected cells, respectively. Dendritic cells act as messengers between the innate and adaptive...
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Cells of the Adaptive Immune Response01:23

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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 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.
The red bone marrow is a soft, spongy tissue nestled in the interior of long bones such as the humerus and femur. It is the site...
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Detailed Structure and Function of Lymph Nodes01:23

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Lymph nodes are bean-shaped structures that cluster along the lymphatic vessels in the inguinal, axillary, and cervical regions. Each node is divided into compartments by a capsule that extends trabeculae inward.
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Functions of the Lymphatic and Immune System01:28

Functions of the Lymphatic and Immune System

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The lymphatic system plays a crucial role in bolstering our immune system. It consists of a network of lymphoid organs, lymph, and lymphatic vessels that provide structural and functional support in safeguarding the body against pathogens such as viruses and bacteria.
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Reactive Lymphadenopathies.

Maria Faraz1, Flavia G N Rosado2

  • 1Department of Health Sciences, McMaster University.

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Summary
This summary is machine-generated.

Pediatric lymphadenitis is often benign but may require biopsy for refractory cases. Histopathology reveals patterns differentiating infections, autoimmune conditions, and mimicking lymphomas.

Keywords:
InfectionsLymph nodeLymphadenitisLymphadenopathyPediatricReactive

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Area of Science:

  • Pediatric Pathology
  • Infectious Diseases
  • Oncology

Background:

  • Lymphadenitis in children is commonly benign and self-limiting, often due to infections.
  • Refractory cases may necessitate lymph node biopsy to exclude malignancy or identify pathogens.
  • Differential diagnosis includes infections, autoimmune disorders, and lymphomas.

Purpose of the Study:

  • To review the histopathological findings in pediatric lymphadenitis.
  • To correlate specific patterns with causative agents or conditions.
  • To aid in the differential diagnosis of pediatric lymphadenitis.

Main Methods:

  • Review of histopathological features of pediatric lymph node biopsies.
  • Correlation of findings with clinical presentation and microbiological/serological data.
  • Identification of characteristic patterns for various etiologies.

Main Results:

  • Acute bacterial infections show necrosis and abscesses.
  • Viral infections present with hyperplasia.
  • Granulomatous inflammation suggests bacterial, mycobacterial, or fungal causes.
  • Toxoplasma lymphadenitis has distinct features like monocytoid B-cell hyperplasia.
  • Certain conditions mimic lymphomas.

Conclusions:

  • Histopathological examination of pediatric lymph nodes is crucial for diagnosis.
  • Recognizing specific patterns aids in differentiating infectious, inflammatory, and neoplastic processes.
  • Accurate diagnosis prevents unnecessary treatment and guides appropriate management.