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AIDS-associated vacuolar myelopathy. A morphometric study

S V Tan1, R J Guiloff, F Scaravilli

  • 1Regional Neurosciences Centre, Charing Cross Hospital, London, UK.

Brain : a Journal of Neurology
|October 1, 1995
PubMed
Summary
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This study quantifies spinal cord pathology in human immunodeficiency virus (HIV)-associated vacuolar myelopathy. Macrophages are prominent in early stages, suggesting a key role in pathogenesis, with lesions often beginning in the mid-thoracic cord.

Area of Science:

  • Neuropathology
  • Infectious Diseases
  • Neuroscience

Background:

  • Vacuolar myelopathy is a common neurological complication in patients with human immunodeficiency virus (HIV).
  • Understanding the pathological progression and cellular mechanisms of vacuolar myelopathy is crucial for potential therapeutic interventions.

Purpose of the Study:

  • To quantitatively assess post-mortem spinal cord pathology in HIV-infected patients with vacuolar myelopathy.
  • To correlate pathological findings with clinical disability and identify the early stages of lesion development.

Main Methods:

  • Post-mortem examination of 20 spinal cords from HIV-infected patients.
  • Quantification of myelin changes, vacuolation, and macrophage density in white matter columns.
  • Severity scoring of spinal cord lesions at different levels and overall, alongside astroglial activation and HIV p24 antigen detection.

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Main Results:

  • In mild-moderate vacuolar myelopathy, macrophages were the predominant feature, with lesions more severe in mid-thoracic regions.
  • Severe vacuolar myelopathy showed equal demyelination, vacuolation, and macrophages, with similar severity across thoracic and cervical levels.
  • Clinical lower limb scores correlated with specific white matter column scores and overall spinal cord severity.

Conclusions:

  • Pathology in vacuolar myelopathy appears to initiate in the mid-low thoracic cord, with rostral progression as severity increases.
  • The prominence of macrophages in early lesions suggests their significant involvement in the pathogenesis of vacuolar myelopathy.
  • Astroglial activation and HIV p24 antigen presence did not directly correlate with vacuolar myelopathy severity.