Brain cavity growth linked to uneven wall stress in 50 adults
In 50 cognitively healthy older adults, cavity walls shifted an average 0.88 millimeters between scans taken four to five years apart.
Limit: Wall loading estimates inherited errors from scan alignment
Edited by Boris Djordjevic · AgingResearch.News
In a longitudinal observational study, researchers analyzed brain scans from 50 cognitively healthy adults aged 70–75 at baseline, including 25 women and 25 men. All were also cognitively healthy at follow-up four to five years later. The researchers developed a method to align each person’s scans and estimate shape changes and physical loading in the lateral ventricles, fluid-filled cavities inside the brain.
Expansion was mostly uniform, but estimated wall loading was highest along cavity edges and a region called the atrium. Among 39 participants with additional imaging, regions with higher estimated loading coincided with bright spots in nearby white matter, the brain’s nerve-fiber tissue. Loading estimates were also higher when these imaging abnormalities were more extensive.
Why it matters
The authors interpret the findings as supporting a hypothesis linking physical loading from age-related ventricular enlargement to white matter degeneration and cognitive decline.
Caveats
The loading measures were estimates derived from scan alignment and inherited its errors. This observational study cannot establish that loading caused white matter damage or cognitive decline; participants were cognitively healthy at both visits.
- Imaging
- Mechanotransduction
- White matter hyperintensities
- Periventricular white matter hyperintensities
- Ventricular mechanomarkers
- Humans
The paper
Stevens Institute of Technology
Biomechanics and Modeling in Mechanobiology, Jun 3, 2026, Open access