Neurosurgery
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Retrospective studies have suggested that aneurysm morphology is a risk factor for subarachnoid hemorrhage (SAH). ⋯ Of the morphological indices, UIA volume seems to predict a future rupture. However, as volume correlates with the maximum diameter of the aneurysm, it seems to add little to the predictive value of the maximum diameter. Retrospective studies using indices that are measured after rupture are of little value in risk prediction.