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Detailed Structure and Function of Lymph Nodes01:23

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...
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Single-port Non-liposuction Endoscopic Axillary Lymph Node Dissection in Breast Cancer Surgery
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Functional variation in lymph node arrangements within the axilla.

A Michael Peters1, J Charlotte Fowler, T Bennett Britton

  • 1Department of Nuclear Medicine, Addenbrooke's Hospital, Cambridge, United Kingdom. a.m.peters@bsms.ac.uk

Lymphatic Research and Biology
|September 26, 2009
PubMed
Summary

This study reveals axillary lymphatic pathways in breast cancer patients. The most common arrangement is a single linear chain of lymph nodes, followed by branching chains and networks.

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Area of Science:

  • Oncology
  • Immunology
  • Anatomy

Background:

  • Understanding lymphatic drainage is crucial for breast cancer staging and treatment.
  • The functional arrangement of axillary lymph nodes influences metastatic spread.
  • Previous studies have not fully elucidated the in vivo functional architecture of axillary lymphatic pathways.

Purpose of the Study:

  • To determine the functional organization of lymphatic pathways within the axilla.
  • To differentiate between single linear chains, branching chains, and networks of axillary lymph nodes.
  • To correlate lymph node activity profiles with anatomical lymphatic arrangements.

Main Methods:

  • Ex vivo dual isotope radioassay was performed on individual lymph nodes from breast cancer patients undergoing axillary clearance.
  • Patients received simultaneous intradermal injections of differentially labeled human immunoglobulin (Tc-99m-HIG and In-111-HIG) into the breast and hand or breast parenchyma.
  • Activity-rank profiles were constructed for each injection site based on isotope content in resected lymph nodes.

Main Results:

  • The majority of activity-rank profiles following intradermal breast injection were mono-exponential (17/30), suggesting a single linear chain of lymph nodes.
  • In most cases where the breast injection profile was mono-exponential, the hand injection profile was also mono-exponential and parallel (11/15).
  • Biphasic profiles, indicative of more complex arrangements, were observed in 12/30 breast injections, often accompanied by parallel biphasic profiles from the alternative site (7/9).

Conclusions:

  • The most common functional arrangement of axillary lymphatic pathways is a single linear chain.
  • Branching linear chains and, less commonly, networks represent alternative functional lymphatic arrangements.
  • These findings provide a clearer understanding of lymphatic functional architecture in the axilla, relevant for cancer metastasis research.