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Cerebral microbleed patterns and the risk of incident dementia in elderly adults: The ARIC study

Peng Zhang1, Huakun Liu1, Xiaotan Ji1

  • 1Department of Neurology, Jining No.1 People's Hospital, Jining, Shandong, China.

Plos One
|January 21, 2026
PubMed
Abstract

Insights

Cerebral microbleeds (CMBs) detected on MRI are linked to a higher risk of developing dementia in older adults. Specific locations and higher counts of CMBs, indicating microvascular damage, are associated with increased incident dementia risk.

Area of Science:

  • Neurology
  • Radiology
  • Epidemiology

Background:

  • Cerebral microbleeds (CMBs) are MRI-visible signs of microvascular damage.
  • The association between CMBs and incident dementia (ID) requires further investigation in community-based cohorts.

Purpose of the Study:

  • To investigate the relationship between CMB presence, number, and location with incident dementia (ID) risk.
  • To analyze the interplay of CMB characteristics and ID in an elderly population.

Main Methods:

  • 1532 dementia-free participants (aged ≥ 65 years) from the ARIC-NCS cohort were analyzed.
  • Incident dementia (ID) cases were diagnosed over an 8.1-year median follow-up period.
  • Cox proportional-hazards models assessed the association of CMB presence, number, and location with ID.

Main Results:

  • Microbleed (MB) presence was associated with a 24% increased ID risk.
  • Individuals with ≥ 2 CMBs showed significantly higher ID risks (57% overall, 174% for lobar MBs).
  • Lobar MBs or superficial siderosis patterns showed the highest ID risk (HR=1.80).

Conclusions:

  • CMB presence, high CMB count (≥ 2), and specific locations are independently associated with increased ID risk.
  • These findings highlight CMBs as crucial indicators of microvascular damage and dementia risk in the elderly.
  • Location and number of CMBs provide specific insights into dementia risk stratification.

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