Hydrocephalus usually does not resolve spontaneously three months after craniotomy, and active treatment is usually required to relieve the clinical symptoms of hydrocephalus. Hydrocephalus is usually caused by cerebrospinal fluid (CSF) circulation disorders, in which too much CSF is produced and too little is absorbed, leading to accumulation of CSF in the ventricles of the brain and resulting in dilatation of the ventricles. Hydrocephalus caused by craniotomy is usually due to a high level of cerebrospinal fluid protein, which blocks the “sieve” for cerebrospinal fluid absorption. Most cases of hydrocephalus do not resolve on their own, but a few cases of mild hydrocephalus may resolve on their own. Hydrocephalus after craniotomy can be treated with lumbar drain and ventriculoperitoneal shunt. Patients with hydrocephalus three months after craniotomy are recommended to seek timely medical treatment and standardize treatment to avoid