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Published on: September 19, 2019

[Wallerian degeneration after stroke: a new prognostic factor?]

João Soares-Fernandes1, Pedro Beleza, Manuel Ribeiro

  • 1Serviços de Neurorradiologia e de Neurologia, Hospital de São Marcos, Braga.

Acta Medica Portuguesa
|June 23, 2007
PubMed

Insights

Wallerian degeneration (WD) following ischemic stroke is detectable via diffusion-weighted imaging within two weeks. This early detection on MRI aids in predicting motor recovery and avoids misinterpretation as new ischemic lesions.

Area of Science:

  • Neurology
  • Radiology
  • Neuroimaging

Background:

  • Wallerian degeneration (WD) is linked to persistent motor deficits after ischemic stroke.
  • Conventional MRI typically shows WD signal changes over four weeks post-stroke.

Observation:

  • A 54-year-old male presented with acute left hemiparesis due to a right middle cerebral artery infarct.
  • MRI at 13 days revealed the infarct and restricted diffusion in the ipsilateral corticospinal tract.

Findings:

  • Wallerian degeneration (WD) was evident on diffusion-weighted imaging (DWI) within two weeks of stroke onset.
  • This contrasts with conventional MRI, which shows changes much later.

Implications:

  • Early WD detection using DWI allows for improved prognostic evaluation of motor recovery after stroke.
  • Abnormal DWI signals in WD should not be mistaken for new ischemic events.

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