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Diffuse axonal injury in early infancy.

G H Vowles, C L Scholtz, J M Cameron

    Journal of Clinical Pathology
    |February 1, 1987
    PubMed
    Summary
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    Diffuse axonal injury, characterized by axonal swelling, was found in infants under 5 months old following closed head injuries. This damage, evident with silver staining, suggests shaking and impact can harm developing brains.

    Area of Science:

    • Neuropathology
    • Pediatric Traumatology
    • Neuroscience

    Background:

    • Diffuse axonal injury (DAI) is a common consequence of traumatic brain injury.
    • DAI in infants presents unique diagnostic challenges due to the developing brain's characteristics.

    Purpose of the Study:

    • To identify and characterize diffuse axonal injury in infants younger than 5 months who sustained closed head injuries.
    • To investigate the potential mechanisms of DAI in early infancy.

    Main Methods:

    • Histopathological examination of infant brains using Nauomenko and Feigin's silver stain.
    • Analysis of axonal discontinuities, retraction balls, and axonal swellings.
    • Correlation of neuropathological findings with injury mechanisms (shaking and impact).

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    Main Results:

    • Diffuse axonal injury was identified in infants aged 5 months and younger with closed head injuries.
    • The silver stain effectively visualized fine, poorly myelinated axons characteristic of the developing brain.
    • Intracerebral hematomata were infrequent, suggesting axonal damage occurs without significant vascular rupture.

    Conclusions:

    • Diffuse axonal injury in early infancy can occur through mechanisms similar to those in adults, involving shaking and impact.
    • The developing brain's poorly myelinated axons are susceptible to damage from non-accidental trauma.
    • Axonal damage may precede or occur independently of significant intracerebral bleeding in infant head injuries.