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Related Experiment Videos

Diffusion-weighted MR in reversible wernicke encephalopathy.

M Bergui1, G B Bradac, J J Zhong

  • 1Neuroradiology Department, SG Battista Hospital, University of Turin, Italy.

Neuroradiology
|January 5, 2002
PubMed
Summary

Diffusion-weighted imaging (DWI) in Wernicke encephalopathy shows extracellular edema, not significant neuronal damage. This finding predicts a favorable prognosis and recovery after thiamine treatment.

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Area of Science:

  • Neuroimaging
  • Neurology
  • Radiology

Background:

  • Wernicke encephalopathy (WE) is a neurological disorder caused by thiamine deficiency.
  • Magnetic resonance imaging (MRI) is crucial for diagnosing WE and assessing its severity.
  • Diffusion-weighted imaging (DWI) offers insights into tissue microstructure and potential neuronal damage.

Observation:

  • Routine MRI revealed hyperintensity in mammillary bodies on T2-weighted and T1-weighted images.
  • Mild hyperintensity was observed on DWI, with increased apparent diffusion coefficient (ADC) values.
  • The DWI findings were attributed to a T2-shine-through effect, indicating extracellular edema.

Findings:

  • DWI and ADC mapping suggest extracellular edema rather than significant neuronal necrosis in this WE case.

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  • The observed MRI alterations resolved following thiamine administration.
  • These imaging findings correlate with the patient's prompt clinical recovery.

    • Implications:

    • DWI may be more sensitive than conventional MRI sequences in detecting early, reversible neuronal injury.
    • Identifying limited neuronal damage via DWI could serve as a favorable prognostic indicator in Wernicke encephalopathy.
    • This approach may help differentiate between reversible edema and irreversible neuronal damage in various brain pathologies.