If hydrocephalus is found after craniotomy, if the amount of hydrocephalus is relatively small, it can be treated with drugs such as furosemide and mannitol as prescribed by the doctor. If the amount of hydrocephalus is large, it can be treated by surgery. Hydrocephalus after craniotomy can be caused by damage to the arachnoid membrane during surgery, bleeding during surgery, or postoperative intracranial infection. If the amount of fluid is relatively small, non-surgical treatments are usually available. Furosemide, mannitol and other medications can be used as prescribed by the doctor, and the patient’s condition can be closely monitored. If when the effusion is more, it will produce some pressure on the brain tissue, and need to be treated in time. Surgical treatment is usually available, such as abdominal shunt of cerebrospinal fluid and dilatation of conduit. Craniotomy is a relatively large operation, it is recommended to go to the neurosurgery department of regular hospitals, and hydrocephalus after the operation should be actively treated under the guidance of doctors to avoid serious consequences.