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Diffuse axonal injury: its mechanism in an assault case
1Research Department, Hamot Medical Center, Erie, PA 16550, USA.
The American Journal of Forensic Medicine and Pathology
|December 1, 1996
Summary
Diffuse axonal injury (DAI) results from shearing of brain axons. This case details a Grade 2 DAI from sideways head impacts during an assault, with microscopic lesions found in the corpus callosum.
Area of Science:
- Neurology
- Trauma Medicine
- Forensic Pathology
Background:
- Diffuse axonal injury (DAI) is a common traumatic brain injury resulting from shearing forces on axons.
- It often occurs in high-impact events like motor vehicle accidents.
- Understanding the mechanisms and classification of DAI is crucial for diagnosis and prognosis.
Observation:
- A case of DAI is reported following a well-witnessed assault involving numerous sideways kicks to the head.
- The victim survived for 13 days post-assault.
- The head movements were characterized by lateral, angular, and rotational motion, leading to low acceleration/deceleration rates.
Findings:
- Gross examination of the brain revealed no visible lesions.
- Microscopic examination identified a lytic lesion within the corpus callosum.
- The observed injuries were classified as Grade 2 diffuse axonal injury according to the Adams classification.
Implications:
- This case highlights a specific mechanism of DAI caused by repetitive, low-acceleration rotational forces.
- It underscores the importance of microscopic examination for diagnosing DAI, even in the absence of gross pathology.
- Findings contribute to the understanding of injury biomechanics in assault cases and forensic investigations.