Schematic of experimental plan. Cytokine analysis of Day 3 CSF of patients with SAH dichotomized between patients who had a good outcome (defined by mRS 0–2) versus poor outcome (mRS 3–5) shows that five cytokines, TNFα, sTREM-1, IL-1α, IL-17 and IL-2, discriminate patients who go on to have good versus poor outcome (above dotted line). Similarly, cytokine analysis of brain homogenates 3 days after SAH shows that three cytokines are significantly different between mice with SAH versus sham, MIP-2, IL-17, and IL-2 (below dotted line). IL-17 and IL-2 are similarly increased in both human SAH and mouse SAH (Box). Student’s T test p≤ 0.05 defined statistical significance.