Prevalence of Unruptured Brain Aneurysms Has Risen
New meta-analysis shows higher aneurysm rates among older adults and those with specific risk factors.
Updated on Oct. 14, 2026 in Stroke
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A systematic review and meta-analysis of over 316,000 individuals has found a crude prevalence of 3.1% for unruptured intracranial aneurysms. This finding highlights a significant increase in observed prevalence among healthy people screened via magnetic resonance angiography over the last two decades.
Why it matters
Understanding the prevalence of these vascular abnormalities is critical for assessing individual risk profiles and informing clinical decisions regarding surveillance. Because aneurysms often present without symptoms, these data provide context for how screening and lifestyle management might evolve.
This systematic review and meta-analysis of 162 articles evaluated data from 316,131 participants, identifying a 3.1% crude prevalence of unruptured intracranial aneurysms. The study found higher prevalence rates among women (5.5%) compared to men (3.0%) and increased risk associated with hypertension and smoking.
The details
Unruptured intracranial aneurysms are localized dilatations of cerebral arteries that remain intact. Researchers analyzed studies published between 2011 and 2025 to determine how prevalence shifts across different populations. The higher rates noted in those with hypertension, active smoking status, and older age reflect established vascular risk factors that may contribute to the weakening of arterial walls over time.
Timeline
2002 to 2015 saw a 2.9% prevalence of aneurysms in healthy individuals.
2016 to 2022 saw prevalence rise to 6.6% in healthy individuals.
January 1, 2011, through December 31, 2025, served as the study publication period.
Health Landscape
This meta-analysis updates the global understanding of vascular health by quantifying how more frequent use of magnetic resonance angiography has shifted observed aneurysm prevalence. It highlights a departure from historical estimates, suggesting that refined screening tools may be uncovering more cases than previously documented.
If you have risk factors such as hypertension or a history of smoking, discuss the potential need for vascular screening with your physician. Recognizing the increased prevalence in older adults serves as a prompt to review your cardiovascular health management strategy during your next checkup.
The takeaway
While prevalence rates are rising, many unruptured aneurysms remain asymptomatic for years. Speak with your physician about your specific cardiovascular risk factors and whether monitoring is recommended for your health profile.
Further reading
For additional context on brain health and vascular screening, explore our latest resources on Stroke.
More information
View the full systematic review and meta-analysis00276-0) for detailed research methodology and clinical findings.
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Do you believe routine medical screening for undiagnosed conditions is beneficial for your long-term health?
