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Cerebral Edema ll: Pathophysiology01:22

Cerebral Edema ll: Pathophysiology

Vasogenic edema is a major form of cerebral edema characterized by abnormal accumulation of fluid in the brain’s extracellular space due to disruption of the blood–brain barrier (BBB). The BBB is a specialized structure composed of endothelial cells connected by tight junctions, supported by astrocytic endfeet and a basement membrane. Under normal conditions, it tightly regulates the movement of ions, proteins, and solutes between the bloodstream and brain parenchyma. When this barrier loses...

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White matter hyperintensity penumbra.

Pauline Maillard1, Evan Fletcher, Danielle Harvey

  • 1Department of Neurology and Center for Neuroscience, School of Medicine, University of California, Davis, Davis, CA, USA.

Stroke
|June 4, 2011
PubMed
Summary
This summary is machine-generated.

White matter hyperintensities (WMH) may indicate broader, subtle white matter damage. Diffusion tensor imaging reveals this widespread injury, suggesting WMH act as a "penumbra" of more extensive white matter changes.

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Area of Science:

  • Neuroimaging
  • White Matter Diseases
  • Cognitive Decline

Background:

  • White matter hyperintensities (WMH) are linked to cognitive decline and cardiovascular risks.
  • The biological significance of WMH as generalized white matter injury indicators remains unclear.

Purpose of the Study:

  • To clarify if WMH represent localized lesions or broader white matter damage.
  • To investigate the relationship between WMH and subtle white matter disruption using diffusion tensor imaging (DTI).

Main Methods:

  • Utilized MRI (FLAIR and DTI) on 208 participants.
  • Quantified WMH and calculated fractional anisotropy (FA) from DTI.
  • Developed a "neighborhood white matter injury score" based on WMH proximity to normal-appearing white matter.

Main Results:

  • Decreased fractional anisotropy correlated with increased neighborhood white matter injury (P < 0.0001).
  • An accelerated rate of FA decrease was observed for injury scores above 0.4 (P < 0.0001).
  • A 1% increase in neighborhood injury score corresponded to a 0.012 decrease in mean FA (P < 0.001).

Conclusions:

  • WMH may signify more widespread, subtle white matter alterations.
  • Introduced the term "white matter hyperintensities penumbra" to describe this phenomenon.
  • Suggests WMH are not isolated lesions but markers of broader white matter pathology.