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Reversible delayed posthypoxic leukoencephalopathy.

S Molloy1, C Soh, T L Williams

  • 1Department of Neurology, Royal Victoria Infirmary, Newcastle upon Tyne, NE1 4LP, England. Sophie.molloy@btopenworld.com

AJNR. American Journal of Neuroradiology
|September 15, 2006
PubMed
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Delayed leukoencephalopathy, a rare condition, can occur after hypoxic ischemic encephalopathy or toxic exposure. This case highlights a reversible form with no gray matter damage, offering new insights into brain injury recovery.

Area of Science:

  • Neurology
  • Radiology
  • Toxicology

Background:

  • Hypoxic ischemic encephalopathy (HIE) and toxic leukoencephalopathy are known causes of white matter abnormalities.
  • These conditions typically manifest with specific patterns of brain injury on MR imaging.
  • Delayed presentations with subsequent recovery are rare for both HIE and toxic leukoencephalopathy.

Observation:

  • A patient presented with delayed neurological symptoms and radiologic changes.
  • The observed changes were consistent with leukoencephalopathy but atypical in their timing and pattern.
  • Clinical and imaging findings excluded significant gray matter involvement.

Findings:

  • The case demonstrated a reversible delayed leukoencephalopathy.
  • This specific presentation occurred following a period of hypoxic ischemic encephalopathy and/or toxic exposure.

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  • Crucially, no evidence of gray matter insult was detected, differentiating it from typical presentations.

    • Implications:

    • This case expands the understanding of the spectrum of leukoencephalopathy.
    • It suggests that delayed and reversible white matter changes without gray matter involvement are possible.
    • The findings may influence diagnostic approaches and prognostication for patients with suspected hypoxic or toxic brain injury.