Fluid accumulation after glioma surgery is not a lesion, it may be postoperative hematoma, subdural effusion, hydrocephalus and other postoperative complications. 1. Postoperative hematoma: mostly subdural hematoma, which may be caused by incomplete hemostasis during operation or decreased intracranial pressure leading to bleeding. 2. Subdural effusion: mainly due to postoperative intracranial hematoma or infection leading to blockage of arachnoid granules, which in turn causes obstruction to the absorption of cerebrospinal fluid and results in the formation of effusion, which can be discharged through drilling and drainage. 3. Hydrocephalus: the cause of its formation is similar to that of subdural effusion, and it is a common postoperative complication of glioma surgery. Before drainage, it should be judged whether there is infection or not, if there is no infection, ventriculoperitoneal shunt can be performed; if infection occurs, puncture and drainage should be carried out to release the inflammatory cerebral effusion, and shunt should be carried out again after controlling the infection. It is recommended that patients with postoperative effusion of glioma should seek medical treatment in time and be actively treated under the guidance of doctors to avoid delaying the condition and causing serious consequences.