Aneurysmal SAH on non-contrast CT — grade by SAH thickness and presence of intraventricular hemorrhage.
CT appearance
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"Thick" = SAH completely filling one or more cisterns or fissures. Higher grades carry greater risk of symptomatic vasospasm / delayed cerebral ischemia. Decision support only — not a substitute for clinical judgment.
Frontera JA, et al. Prediction of symptomatic vasospasm after SAH: the modified Fisher scale. Neurosurgery. 2006;59(1):21–27.