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Differences in lobar microbleed topography in cerebral amyloid angiopathy and hypertensive arteriopathy

Pin-Yan Kuo1, Hsin-Hsi Tsai2, Bo-Ching Lee3

  • 1Department of Medical Education, National Taiwan University Hospital, Taipei, Taiwan.

Scientific Reports
|February 15, 2024
PubMed

Insights

Cerebral amyloid angiopathy (CAA) is strongly linked to intracortical lobar microbleeds, while hypertensive arteriolosclerosis is associated with subcortical ones. Anatomical location of microbleeds helps differentiate these conditions.

Area of Science:

  • Neurology
  • Neuroimaging
  • Cerebrovascular Diseases

Background:

  • Lobar cerebral microbleeds are observed in both cerebral amyloid angiopathy (CAA) and hypertensive arteriolosclerosis.
  • Distinguishing between these conditions based on microbleed location is crucial for accurate diagnosis.

Purpose of the Study:

  • To investigate the association between the anatomical location of lobar microbleeds and the underlying microangiopathy (CAA vs. hypertensive arteriolosclerosis).
  • To determine if microbleed categorization can improve neuroimaging accuracy for cerebral small vessel disease.

Main Methods:

  • Ninety-one intracerebral hemorrhage survivors with lobar microbleeds underwent brain MRI and amyloid PET.
  • Lobar microbleeds were categorized as intracortical, juxtacortical, or subcortical.
  • Associations between microbleed location, microangiopathy subtypes, and amyloid deposition (Pittsburgh Compound-B PET SUVR) were assessed.

Main Results:

  • Patients with CAA showed a higher prevalence of intracortical lobar microbleeds (80.0%) and lower prevalence of subcortical ones (13.3%) compared to hypertensive arteriolosclerosis patients.
  • Strictly intracortical/juxtacortical microbleeds were associated with CAA (OR 18.9), while subcortical microbleeds were linked to hypertensive arteriolosclerosis (OR 10.9).
  • Higher amyloid retention correlated with intracortical microbleeds and inversely with subcortical microbleeds.

Conclusions:

  • Strictly intracortical/juxtacortical lobar microbleeds are more strongly associated with CAA and cortical amyloid deposition than subcortical microbleeds.
  • Categorizing lobar microbleeds by location aids in differentiating underlying microangiopathies.
  • This approach may enhance the accuracy of neuroimaging for cerebral small vessel disease diagnosis.

Keywords:
Cerebral amyloid angiopathyCerebral microbleedHypertensionIntracerebral hemorrhagePittsburgh Compound BSmall vessel disease

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