High MCP-1 concentration in the CSF was positively correlated with hematoma dimension quantified by the Hijdra sum score classification (Fig. 4F, MCP day 1, r2 = 0.1998, p = 0.0194), by the WFNS score (Fig. 4G, MCP-1 day 1, r2 = 0.1562, p = 0.0413; Fig. 4H, MCP-1 day 7, r2 = 0.4795, p = < 0.0001) and by the Hunt & Hess grade (Fig. 4I, MCP-1 day 7, r2 = 0.2346, p = 0.0078). Here, CCL2 is linked to hematoma.