An estimated 3.5% of the global population lives with an unruptured brain aneurysm. The risk of rupture is low, but the consequences are often fatal, with mortality rates reaching 50%.
Key Takeaways
- About 3-5% of the U.S. population has an unruptured brain aneurysm
- Mortality 40-50% for ruptured brain aneurysms
- Smoking increases aneurysm risk by 4.3 times
- Symptomatic aneurysm rupture warning headache in 40-50%
- Coiling treats 70-80% of aneurysms endovascularly
Aneurysm statistics highlight that early detection can significantly reduce risk and improve outcomes.
Related reading
01 · Category
Epidemiology30 stats
01
About 3-5% of the U.S. population has an unruptured brain aneurysm
02
Globally, brain aneurysms affect approximately 3.5% of the population
03
Incidence of subarachnoid hemorrhage from aneurysm rupture is 6-10 per 100,000 person-years
04
Aortic aneurysms account for about 1-2% of deaths in men over 65
05
Prevalence of abdominal aortic aneurysm (AAA) in men aged 65-74 is 5.5%
06
Unruptured intracranial aneurysms are found in 3.6-6% of autopsies
07
Annual rupture rate for unruptured aneurysms is 0.5-1%
08
AAA prevalence in smokers is 4 times higher than non-smokers
09
Brain aneurysms are more common in women (2:1 ratio)
10
Incidence of ruptured brain aneurysms peaks between ages 40-60
11
About 30,000 people in the U.S. suffer aneurysm ruptures annually
12
Global incidence of aneurysmal subarachnoid hemorrhage is 10.5 per 100,000
13
Thoracic aortic aneurysms prevalence is 0.1% in general population
14
Mycotic aneurysms occur in 2-4% of infective endocarditis cases
15
Familial intracranial aneurysms in 10-20% of cases
16
AAA screening detects aneurysms in 1.3% of screened men 65-74
17
Unruptured aneurysm prevalence on angiography is 2-4%
18
Rupture risk increases with aneurysm size >7mm (3-15%)
19
Popliteal artery aneurysms in 0.1-2.8% of peripheral aneurysms
20
Brain aneurysm rupture causes 10% of all strokes
21
AAA rupture incidence is 5-10 per 100,000
22
Women have higher rupture risk for same size aneurysms
23
Prevalence of intracranial aneurysms in hypertensive patients is 6.9%
24
Annual detection rate of unruptured aneurysms rising due to imaging
25
Splenic artery aneurysms in 0.04-0.1% population
26
Renal artery aneurysms prevalence 0.65%
27
Cavernous carotid aneurysms in 2-9% of intracranial aneurysms
28
Incidence of pediatric aneurysms is 0.5-2 per million
29
HIV-associated aneurysms in 4.5% of cases
30
Overall aneurysm prevalence in adults >30 is ~2%
Interpretation
Epidemiology Interpretation
While statistically you're more likely to win a small lottery than suffer a rupture, these silent, ticking timepieces hidden in a surprising number of us underscore why vigilance, not panic, is the prescribed response to such pervasive fragility.
02 · Category
Prognosis and Mortality21 stats
01
Mortality 40-50% for ruptured brain aneurysms
02
50% of ruptured AAA patients die before hospital
03
Good outcome (mRS 0-2) in 66% coiled vs 53% clipped (ISAT)
04
30-day mortality post-EVAR 1.8%
05
Case fatality for SAH 45%
06
Rebleeding mortality 20-30% if untreated
07
Delayed cerebral ischemia causes 25% poor outcomes
08
5-year survival post-AAA repair 70%
09
WFNS grade 5 has 70% mortality
10
Unruptured aneurysm repair morbidity 10-15%
11
Ruptured thoracic aneurysm mortality 70-90%
12
1-year mortality post-SAH 50% in elderly
13
Vasospasm mortality contribution 15%
14
EVAR rupture prevention reduces mortality 50-70%
15
Hydrocephalus increases mortality 20%
16
Seizures worsen prognosis (OR 2.3)
17
Fisher grade 4 SAH has 60% poor outcome
18
Long-term cognitive impairment in 50% SAH survivors
19
AAA >5.5cm rupture risk 10%/year
20
Pediatric aneurysm mortality 20-40%
21
Re-rupture after coiling 1-2%/year
Interpretation
Prognosis and Mortality Interpretation
While the cold calculus of survival reveals a grim landscape—where a coin flip often decides fate after rupture and even a "good" outcome can come with a lifetime of cognitive fog—these very statistics are the stark battleground upon which every advance in treatment wages a defiant, percentage-point-by-percentage-point war for life.
03 · Category
Risk Factors23 stats
01
Smoking increases aneurysm risk by 4.3 times
02
Hypertension is present in 60-70% of ruptured aneurysm cases
03
Family history increases risk 4-6 fold
04
Smoking doubles the risk of AAA development
05
Age >55 is a major risk factor for aortic aneurysms
06
Female sex increases rupture risk for brain aneurysms
07
Polycystic kidney disease associated with 10-20% aneurysm prevalence
08
Atherosclerosis contributes to 90% of AAAs
09
Connective tissue disorders like Marfan syndrome increase risk 15-fold
10
Hypercholesterolemia raises AAA risk by 2.5 times
11
Alcohol consumption >2 drinks/day triples risk
12
Cocaine use associated with 1.5-3.6% mycotic aneurysms
13
Ehlers-Danlos syndrome type IV has 25-50% aneurysm risk
14
Obesity increases AAA growth rate by 20%
15
African American ethnicity higher rupture risk for same size
16
Prior aneurysm doubles risk for new ones
17
Diabetes may protect against AAA (OR 0.6)
18
Loeys-Dietz syndrome has 50% aortic aneurysm risk
19
Bicuspid aortic valve increases thoracic aneurysm risk 20-fold
20
Estrogen deficiency post-menopause raises risk
21
Chronic obstructive pulmonary disease (COPD) increases AAA risk 2.7-fold
22
Radiation exposure elevates risk by 2-3 times
23
Antihypertensive use reduces rupture risk by 30%
Interpretation
Risk Factors Interpretation
While your family tree, high blood pressure, and pack-a-day habit are conspiring to turn your arteries into over-inflated party balloons, remember that laying off the smokes and managing your hypertension are like bringing a sober, responsible friend to that dangerous soiree in your chest.
More related reading
04 · Category
Symptoms and Diagnosis27 stats
01
Symptomatic aneurysm rupture warning headache in 40-50%
02
Sudden severe headache ("thunderclap") in 70-80% of ruptures
03
Nausea/vomiting occurs in 70% of subarachnoid hemorrhage cases
04
Neck stiffness in 30-40% post-rupture
05
Visual disturbances in 20-30% with unruptured aneurysms
06
Cranial nerve palsies (III, IV, VI) in 15-20%
07
Photophobia common in 25% of cases
08
Altered consciousness in 50% at rupture
09
Seizures in 10-25% post-rupture
10
Back/abdominal pain in 50% of AAA ruptures
11
Pulsatile abdominal mass in 30-50% of intact AAAs
12
Facial pain or numbness if cavernous sinus involvement
13
CTA detects 95% of aneurysms >3mm
14
MRI/MRA sensitivity 85-95% for unruptured aneurysms
15
DSA gold standard with 95-99% sensitivity
16
Ultrasound screens AAA with 95% sensitivity >3cm
17
WFNS grade predicts outcome; grade 1 has 93% good recovery
18
Sentinel bleed (warning leak) in 40-50% before major rupture
19
Hydrocephalus in 20-30% post-SAH
20
Loss of consciousness at ictus in 45%
21
Focal deficits like hemiparesis in 15%
22
Fundoscopic exam shows subhyaloid hemorrhage in 20%
23
CT shows hyperdensity in 95% within 24h of SAH
24
Lumbar puncture xanthochromia after 12h in 100%
25
Mass effect symptoms in giant aneurysms (>25mm) 50%
26
Claudication or embolism in peripheral aneurysms 30%
27
Sudden hypotension/shock in 80% AAA rupture
Interpretation
Symptoms and Diagnosis Interpretation
If you can't decide between calling your new sudden, severe headache "The Exorcist" or "The Final Warning Siren," statistically, it's probably both.
05 · Category
Treatment22 stats
01
Coiling treats 70-80% of aneurysms endovascularly
02
Clipping success rate 90-95% for accessible aneurysms
03
EVAR reduces perioperative mortality to 1.2% vs 4.4% open repair
04
ISAT trial: coiling better than clipping (23% vs 30% mortality/disability)
05
Flow diversion success 75-90% for large aneurysms
06
Beta-blockers reduce aortic growth by 25-40%
07
Nimodipine reduces poor outcome by 30% post-SAH
08
Endovascular repair for thoracic aneurysms 85% success
09
Stent-assisted coiling in 20-30% complex cases
10
Watchful waiting for <7mm unruptured aneurysms
11
Statins slow AAA expansion by 0.5mm/year less
12
Decompressive craniectomy in 10-15% severe SAH
13
Pipeline embolization device occludes 90% at 1 year
14
Open repair durability 95% at 5 years for AAA
15
Vasospasm prophylaxis with nimodipine in 100% SAH patients
16
TEVAR mortality <2% in high-volume centers
17
Aspirin reduces growth in small aneurysms 20%
18
Intra-arterial milrinone for vasospasm 70% improvement
19
Rebleeding prevention with antifibrinolytics controversial
20
Radiation therapy for inoperable aneurysms 50-70% occlusion
21
Angioplasty for vasospasm 60-80% angiographic success
22
Surveillance ultrasound every 6-12 months for small AAA
Interpretation
Treatment Interpretation
In the high-stakes poker game of aneurysm management, while clipping shows a strong hand for accessible targets and endovascular techniques like coiling increasingly raise the stakes with less invasive plays, the house always wins by emphasizing that the best intervention is often a tailored strategy blending prevention, timely action, and vigilant waiting.
Reference
Cite This Report
This report is designed to be cited. We maintain stable URLs and versioned verification dates. Copy the format appropriate for your publication below.
APA
Samuel Norberg. (2026, February 13). Aneurysm Statistics. Gitnux. https://gitnux.org/aneurysm-statistics
MLA
Samuel Norberg. "Aneurysm Statistics." Gitnux, 13 Feb 2026, https://gitnux.org/aneurysm-statistics.
Chicago
Samuel Norberg. 2026. "Aneurysm Statistics." Gitnux. https://gitnux.org/aneurysm-statistics.
Sources & references
25 datasets cited across this report · attribution is report-level