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Diffusion- and perfusion-weighted MR imaging in persistent migrainous visual disturbances.

H R Jäger1, N J Giffin, P J Goadsby

  • 1Headache Group, Institute of Neurology, the National Hospital for Neurology and Neurosurgery, London, UK.

Cephalalgia : an International Journal of Headache
|April 21, 2005
PubMed
Summary

Advanced MR imaging revealed no significant changes in water diffusion or cerebral perfusion in patients experiencing persistent visual disturbances like migraine aura or visual snow, suggesting these factors are not key to the condition.

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Area of Science:

  • Neuroimaging
  • Neurology
  • Radiology

Background:

  • Migraine aura and visual snow pathophysiology remain poorly understood.
  • Previous studies noted diffusion and perfusion changes in other migraine types.

Observation:

  • Four patients with persistent visual disturbances (migraine aura, visual snow) underwent advanced MR imaging.
  • Conventional structural MRI scans were normal in all participants.

Findings:

  • MR perfusion and diffusion imaging showed symmetrical results across all patients.
  • No evidence of reduced water diffusion or cerebral perfusion was detected in the occipital regions or elsewhere.
  • Apparent diffusion coefficient (ADC) measurements did not differ significantly between visual cortices and other brain regions.

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Implications:

  • Regional alterations in water diffusion and perfusion are unlikely to be primary factors in the pathophysiology of persistent migraine aura or visual snow.
  • Further research may explore other potential mechanisms underlying these visual disturbances.