Brain scan findings linked to later stroke and dementia
Signs of past strokes in the brain’s outer layer were linked to later stroke: adjusted hazard ratio 1.8 versus people without the scan findings.
Our read
Biomarkers- Studied:
- Cohort study of 367,988 people in Scotland with brain scans, against people without the scan findings
- What changed:
- Stroke risk was higher in people with outer-layer strokes: adjusted hazard ratio 1.8 versus people without the scan findings
- The catch:
- The cohort included only people who underwent brain scans, excluding prior neurological disease
- Why it’s aging research:
- It bears on staying healthy in midlife and later life.
Editor of record: Boris Djordjevic · AgingResearch.News
An observational cohort study tracked 367,988 people in Scotland with brain scans from 2010–2018 and no prior hospitalization for neurological disease; 54% were over 55. Researchers used text-analysis software to identify signs of blood-vessel damage and brain shrinkage in routine scan reports. Median follow-up was 5.0 years among people with these findings and 7.0 years among those without.
Signs of past strokes in the brain’s outer layer were linked to later stroke. Brain shrinkage was linked to dementia, with an adjusted hazard ratio of 1.7 versus people without the scan findings. Hazard ratios compare event rates during follow-up. The analyses accounted for age, other scan findings and health factors. Over five years, stroke occurred in 11% of people with outer-layer strokes, and dementia in 26% of those with brain shrinkage.
Why it matters
The authors called for policymakers to prioritize neurological disease prevention in people with these brain blood-vessel changes, an issue relevant to preventing stroke and dementia in later life.
Caveats
This observational study cannot show cause and effect. The cohort included people who underwent brain scans and excluded those with recorded neurological disease before or within six months after scanning.
The paper
University of Edinburgh; British Heart Foundation
Journal of Neurology, Neurosurgery, and Psychiatry, Mar 14, 2026, Open access
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