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Secondary Lymphoid Organs

Secondary Lymphoid Organs

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...

Lymphoid Cells and Tissues

Lymphoid Cells and Tissues

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...

Primary Lymphoid Organs

Primary Lymphoid Organs

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...

Detailed Structure and Function of Lymph Nodes

Detailed Structure and Function of Lymph Nodes

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.
From a histological perspective, lymph nodes can be split into two main areas: the superficial cortex and the deep medulla. The outer cortex is populated by dendritic cells, macrophages, and B lymphocytes, which are densely packed into follicles. When these B-lymphocytes are presented...

B Cell Activation and Differentiation

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...

Cells of the Adaptive Immune Response

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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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Enhancing Tumor Content through Tumor Macrodissection

Enhancing Tumor Content through Tumor Macrodissection

Published on: February 12, 2022

Marginal zone mucosa associated lymphoid tissue diffuse large B cell lymphoma.

Adrian Pedro Noriega Aldave¹, Shikha Jaiswal¹, Stephen L Davidson¹

¹Department of Internal Medicine, University of Alabama at Birmingham Health Center Montgomery, Alabama, United States.

North American Journal of Medical Sciences

|September 12, 2014

Summary

Orbital lymphomas are rare, and this case details a unique instance of diffuse large B cell lymphoma evolving from MALT lymphoma. This transformation highlights a rare pathway in orbital oncology.

Keywords:

Diffuse large B cell lymphoma Marginal zone mucosa-associated lymphoid tissue lymphoma Orbital lymphoma Rituximab

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Area of Science:

Ophthalmology
Oncology
Pathology

Background:

Non-Hodgkin's lymphoma (NHL) primarily affecting the orbit is uncommon.
Coexistence of two distinct NHL cell types is a rare pathological finding.

Observation:

A 62-year-old male presented with orbital lymphoma.
Rare histopathological findings indicated a transformation of one cell type into another.

Findings:

Tissue diagnosis and molecular studies revealed diffuse large B cell lymphoma evolving from MALT lymphoma.
This represents a unique case of B-cell transformation within the orbit.

Implications:

The simultaneous proliferation of distinct B-cell types leading to malignancy has not been previously documented in the orbit.
Such aggressive tumors necessitate prompt chemo-immunotherapy for effective management.