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Cerebral microbleeds in the elderly: a pathological analysis

Mark Fisher1, Samuel French, Ping Ji

  • 1Department of Neurology, University of California, Irvine, CA 92868, USA. mfisher@uci.edu

Stroke
|October 30, 2010
PubMed
Abstract

Insights

Cerebral microbleeds are common in elderly brains, often occurring at the capillary level. These iron deposits can be found in macrophages and pericytes, independent of amyloid or hypertension.

Area of Science:

  • Neuropathology
  • Geriatric Medicine
  • Neuroimaging

Background:

  • Cerebral microbleeds are frequently detected in elderly individuals via brain MRI.
  • Understanding the underlying pathology of these microbleeds is crucial.

Purpose of the Study:

  • To elucidate the pathological basis of cerebral microbleeds in the elderly.
  • To characterize the cellular localization of iron deposits in microbleeds.

Main Methods:

  • Postmortem brain specimens from 33 elderly individuals (71-105 years) were analyzed.
  • Microbleeds were identified by hemosiderin staining (iron detection).
  • Immunohistochemistry and electron microscopy were used to determine iron localization in macrophages and pericytes; beta-amyloid presence was also assessed.

Main Results:

  • Cerebral microbleeds were present in 22 cases, occurring at capillary, small artery, and arteriolar levels.
  • Microbleeds were found independently of amyloid deposition and hypertension.
  • The putamen was the most common site; capillary microbleeds frequently involved macrophages, with pericyte involvement noted in electron microscopy.

Conclusions:

  • Cerebral microbleeds are a common finding in the elderly brain.
  • Microbleeds can originate at the capillary level.
  • Pathological characterization reveals iron deposition in macrophages and pericytes.

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