An autopsy study of human axillary lymph node histology

Area of Science:

• Histopathology
• Immunology
• Pathology

Background:

• Axillary lymph nodes play a crucial role in immune surveillance.
• Understanding their normal histology and age-related changes is essential for diagnosing various conditions.
• Previous studies have provided limited data on specific histological features in relation to age and cause of death.

Purpose of the Study:

• To investigate the histological features of axillary lymph nodes in a large autopsy cohort.
• To correlate observed histological changes with demographic factors (age) and clinical outcomes (cause of death).
• To contribute to the understanding of lymph node morphology in neonates.

Main Methods:

• Histologic examination of axillary lymph nodes from 487 autopsies.
• Evaluation of key histological features: germinal centers, deep cortical regions, sinus histiocytosis, hyaline deposition, fibrosis, and cellularity.
• Correlation of histological findings with age and cause of death.

Main Results:

• Germinal centers were more prevalent in younger individuals, decreasing with age.
• Hyaline deposition showed a positive correlation with increasing age.
• Lymphocyte depletion, fibrosis, and hyaline deposits were associated with chronic diseases, especially cancer.
• Hemorrhage deaths exhibited selective depletion of deep cortical regions.
• Distinct lymph node morphology in neonates was characterized.

Conclusions:

• Axillary lymph node histology exhibits significant age-dependent changes.
• Chronic disease and hemorrhage lead to distinct histological alterations in lymph nodes.
• The study provides valuable baseline data for interpreting lymph node pathology across the lifespan.