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    Attention COACH STUDY participants:

    The principal investigators of the study request that you use the official version of the modified score here.

    PHASES Score

    Predicts 5-year risk of rupture of intracranial aneurysms.

    INSTRUCTIONS

    Use this score to calculate the 5-year risk of rupture of cerebral aneurysms that are found incidentally on imaging. 

    This score was derived only from North American, European, Japanese, and Finnish populations. Score should be interpreted with caution if using outside of these populations.

    When to Use

    Do you use the PHASES Score and want to contribute your expertise? Join our contributor team!

    North American, European (other than Finnish)
    0
    Japanese
    +3
    Finnish
    +5
    No
    0
    Yes
    +1
    <70 years
    0
    ≥70 years
    +1
    <7.0 mm
    0
    7.0-9.9 mm
    +3
    10.0-19.9 mm
    +6
    ≥20.0 mm
    +10
    No
    0
    Yes
    +1
    Internal carotid artery (ICA)
    0
    Middle cerebral artery (MCA)
    +2
    Anterior cerebral arteries (ACA), posterior communicating artery, posterior circulation
    +4

    Result:

    Please fill out required fields.

    Next Steps
    Evidence
    Creator Insights
    Dr. Jacoba P. Greving

    About the Creator

    Jacoba P. Greving, MD, is an epidemiologist at the Dutch College of General Practitioners in Utrecht, Netherlands. She was awarded the Rudolf Magnus Young Talent Fellowship in 2013. Dr. Greving’s primary research is focused on risks associated with intracranial aneurysms.

    To view Dr. Jacoba P. Greving's publications, visit PubMed

    Are you Dr. Jacoba P. Greving? Send us a message to review your photo and bio, and find out how to submit Creator Insights!
    MDCalc loves calculator creators – researchers who, through intelligent and often complex methods, discover tools that describe scientific facts that can then be applied in practice. These are real scientific discoveries about the nature of the human body, which can be invaluable to physicians taking care of patients.
    About the Creator
    Dr. Jacoba P. Greving
    Are you Dr. Jacoba P. Greving?
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