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Summary
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Cerebral microbleeds (CMBs) detected in vivo persist post-mortem and are visible on ex vivo MRI. Higher CMB counts correlate with cognitive decline and cerebral amyloid angiopathy (CAA).

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Area of Science:

  • Neuroimaging
  • Neuropathology
  • Gerontology

Background:

  • Cerebral microbleeds (CMBs) are small hemorrhages common in older adults.
  • CMBs are associated with cognitive decline, reduced brain volume, and increased risk of stroke and mortality.
  • This study investigated CMBs using both in vivo and ex vivo MRI, correlating findings with clinical and pathological data.

Purpose of the Study:

  • To investigate the persistence and detectability of cerebral microbleeds (CMBs) using in vivo and ex vivo MRI.
  • To assess the association between CMBs and clinical evaluations, including cognitive function.
  • To examine the relationship between CMBs and neuropathologies, such as cerebral amyloid angiopathy (CAA).

Main Methods:

  • A longitudinal study of 37 community-dwelling older adults included annual cognitive testing and 3T MRI (3D-T1w MPRAGE and ME-GRE).
  • Post-mortem, ex vivo MRI (3D ME-SE and ME-GRE) was performed on one cerebral hemisphere.
  • Neuropathologic assessment included cerebrovascular pathologies; CMBs were annotated on both in vivo and ex vivo MRI for comparison.

Main Results:

  • 59% of participants had at least one CMB on ex vivo MRI; 65% showed exact matches between in vivo and ex vivo CMBs.
  • Ex vivo CMB counts were higher than in vivo counts in all mismatched cases.
  • Increased ex vivo CMB counts correlated with longer antemortem intervals, greater cognitive impairment, and presence of CAA.

Conclusions:

  • Cerebral microbleeds (CMBs) observed during life persist in the brain and are detectable on ex vivo MRI.
  • The number of CMBs increases over time in individuals experiencing cognitive impairment and cerebral amyloid angiopathy (CAA).
  • This study validates CMB detection methods and highlights their progression in aging brains.