MMP9 and Hydrocephalus: Therefore, it is crucial to unravel expression levels and the diagnostic value of serum NLRP3, MMP‐9 and IFN‐γ in patients with hydrocephalus and intracranial infections after craniotomy, which will provide a reference for further clarifying the pathogenesis of hydrocephalus and intracranial infection, as well as new ideas for clinical prediction and management of hydrocephalus and intracranial infection.