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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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Reticular Dermis01:15

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The papillary and reticular dermis are the two layers of the dermis. They are made of connective tissue with fibers of collagen extending from one to the other, making the border between the two somewhat indistinct. The dermal papillae extending into the epidermis belong to the papillary layer, whereas the dense collagen fiber bundles below belong to the reticular layer.
Reticular Layer
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Hypersensitivity Reactions: Immune-Complex Reactions01:19

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Type III hypersensitivity reactions occur when antigen–antibody complexes form and activate the complement system. Normally, these complexes help the clearance of antigens by phagocytes and red blood cells. However, when large numbers of immune complexes are present, they can deposit in tissues—particularly in the walls of blood vessels—leading to inflammation and tissue injury. These deposits trigger complement activation and neutrophil recruitment, resulting in serum...
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Gastritis is marked by disruption of the mucosal barrier that usually protects the stomach tissue from digestive juices and manifests in acute and chronic forms.
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Skin Diseases and Disorders01:23

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Skin is the first line of defense and encounters a variety of microbes. Some pathogenic strains are often the cause of a broad range of infections of the skin and other body systems. These conditions can affect people of all ages and may have different causes, including genetic factors, infections, autoimmune reactions, environmental factors, and lifestyle choices.
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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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Granulocyte-dependent Autoantibody-induced Skin Blistering
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Granuloma Annulare.

Emily Louise Keimig1

  • 1Department of Dermatology, Northwestern University, 676 North St Clair, Suite 1600, Chicago, IL 60611, USA.

Dermatologic Clinics
|July 6, 2015
PubMed
Summary

Granuloma annulare is a skin condition involving collagen degeneration. Treatment depends on disease severity and patient factors.

Area of Science:

  • Dermatology
  • Immunology

Background:

  • Granuloma annulare (GA) is a noninfectious granulomatous skin condition with diverse presentations.
  • Histologically, GA features collagen degeneration, mucin deposition, and characteristic histiocytes.
  • The exact pathogenesis of GA remains unclear, but a cell-mediated hypersensitivity reaction is suspected.

Purpose of the Study:

  • To provide a comprehensive overview of Granuloma annulare.
  • To discuss the clinical presentation, underlying mechanisms, systemic associations, and treatment strategies for GA.

Main Methods:

  • Review of existing literature on Granuloma annulare.
  • Synthesis of information regarding histology, immunology, and clinical management.

Main Results:

Keywords:
GA diabetesGA etiologyGA hyperlipidemiaGA infectionGA malignancyGA thyroidGA treatmentGranuloma annulare (GA)

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  • GA presents with varied skin morphologies and specific histological findings.
  • Atypical GA is associated with systemic conditions like diabetes, thyroid disorders, and malignancy.
  • Treatment options range from localized therapies to systemic immunomodulatory approaches.

Conclusions:

  • Granuloma annulare management requires consideration of disease extent, comorbidities, and patient preferences.
  • Further research into the antigen involved in GA pathogenesis is warranted.