Neurology · Neurosurgery

PHASES Score for Intracranial Aneurysm Rupture calculator

Enter the published formula inputs below to calculate and interpret this score.

Clinical inputs

Population

Hypertension

Age

years

Allowed range: 18–110 years

One point at age 70 years or older. Age 69 does not score.

Maximum aneurysm diameter

Allowed range: 1–50 mm

Below 7.0 mm scores 0. From 7.0 mm to below 10.0 mm scores 3. From 10.0 mm to below 20.0 mm scores 6. 20.0 mm or larger scores 10.

Earlier subarachnoid hemorrhage from a different aneurysm

Aneurysm site

Anterior cerebral includes the anterior communicating and pericallosal arteries. Posterior circulation includes vertebral, basilar, cerebellar, and posterior cerebral arteries.

Result

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Professional use only

For qualified clinicians. Independently verify inputs, calculations, source guidance, and applicability before any clinical action. This calculator does not replace clinical judgment.

Source: Greving JP et al. Development of the PHASES score for prediction of risk of rupture of intracranial aneurysms: a pooled analysis of six prospective cohort studies. Lancet Neurol. DOI: 10.1016/S1474-4422(13)70263-1. PMID: 24290159. Table 4: Japanese 3, Finnish 5; hypertension 1; age ≥70 years 1; size 7.0–9.9 mm 3, 10.0–19.9 mm 6, ≥20 mm 10; earlier SAH from another aneurysm 1; MCA 2; ACA, posterior communicating artery, or posterior circulation 4. Figure 3 five-year rupture risk is 0.4% at ≤2 points, then 0.7, 0.9, 1.3, 1.7, 2.4, 3.2, 4.3, 5.3, and 7.2% for scores 3 through 11, and 17.8% at ≥12. The paper's example is 7 points and 2.4%. (2014)

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Clinical inputs

Population
Hypertension
Age (years)Accepted range: 18 to 110
Maximum aneurysm diameter (mm)Accepted range: 1 to 50
Earlier subarachnoid hemorrhage from a different aneurysm
Aneurysm site

Primary source

Greving JP et al. Development of the PHASES score for prediction of risk of rupture of intracranial aneurysms: a pooled analysis of six prospective cohort studies. Lancet Neurol. DOI: 10.1016/S1474-4422(13)70263-1. PMID: 24290159. Table 4: Japanese 3, Finnish 5; hypertension 1; age ≥70 years 1; size 7.0–9.9 mm 3, 10.0–19.9 mm 6, ≥20 mm 10; earlier SAH from another aneurysm 1; MCA 2; ACA, posterior communicating artery, or posterior circulation 4. Figure 3 five-year rupture risk is 0.4% at ≤2 points, then 0.7, 0.9, 1.3, 1.7, 2.4, 3.2, 4.3, 5.3, and 7.2% for scores 3 through 11, and 17.8% at ≥12. The paper's example is 7 points and 2.4%. (2014)

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