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Walk the Even Hospital Database by book and chapter — the raw source passages that ground Ask, DDx, and the rest.
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©2013 UpToDate ® Print Email Risk of aneurysm based on internal and external dysfunction of the third nerve Internal and external dysfunction Risk of aneurysm Recommendation Complete internal dysfunction ("pupil blown") With complete external dysfunction Highest MRI/MRA (CTA) catheter angiogram With incomplete external dysfunction Highest MRI/MRA (CTA) catheter angiogram Without external dysfunction Minimal No imaging Incomplete internal dysfunction ("partial pupil") With complete external dysfunction Uncertain, probably low MRI/MRA (CTA) consider catheter angiogram With incomplete external dysfunction Uncertain, minimal MRI/MRA (CTA) consider catheter angiogram Without external dysfunction Minimal No imaging No internal dysfunction ("pupil not involved") With complete external dysfunction Low if isolated Observe With incomplete external dysfunction Uncertain MRI/MRA (CTA) consider catheter angiogram MRA: magnetic resonance angiography; MRI: magnetic resonance imaging; CTA: computed tomography angiography.