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Forest plots for CSF drainage on SDHC prevention and different drainage method comparison: (A) No difference was found in SDHC prevention between CSF drainage group and no CSF drainage group; (B) LD had better long-term recovery than EVD; (C) no difference was found in vasospasm prevention between LD and EVD. CSF = cerebrospinal fluid, EVD = external ventricular drainage, LD = lumbar drainage, SDHC = shunt-dependent hydrocephalus.
