Diffuse axonal injury in craniocerebral trauma. A comparative histologic and immunohistochemical study

Area of Science:

• Neuropathology
• Histology
• Trauma Research

Background:

• Diffuse axonal injury (DAI) is a critical consequence of craniocerebral trauma.
• Axonal swellings are the primary histological indicator of DAI.
• Accurate detection of axonal swellings is crucial for diagnosing and understanding head injuries.

Purpose of the Study:

• To compare the efficacy of conventional and immunohistochemical staining methods for visualizing axonal swellings in head trauma.
• To quantitatively assess the number of axonal swellings identified by different staining techniques.
• To determine the most reliable method for detecting DAI-related axonal pathology.

Main Methods:

• Examined 11 head trauma cases, focusing on brain regions susceptible to DAI.
• Utilized hematoxylin-eosin, Bodian silver stain, and immunohistochemical markers (neurofilaments, ubiquitin, tau, beta/A4-amyloid).
• Performed quantitative analysis of axonal swellings visualized with each stain.

Main Results:

• Hematoxylin-eosin reliably detected axonal swellings in most cases.
• Silver and neurofilament stains identified fewer swellings and were harder to interpret.
• Ubiquitin staining revealed the highest number of axonal swellings.
• Tau and beta/A4-amyloid antibodies did not visualize axonal swellings.

Conclusions:

• Hematoxylin-eosin is a superior and reliable method for detecting axonal swellings in craniocerebral trauma compared to Bodian and neurofilament stains.
• Immunocytochemical staining for ubiquitin enhances the identification and quantitative assessment of diffuse axonal injury.
• These findings support the use of specific histological and immunohistochemical techniques for improved DAI diagnosis.