The specific surgical procedure of craniotomy varies according to the purpose of surgery, generally there are surgery to remove hematoma, intracranial tumor surgery, ventriculoperitoneal shunt, etc., as follows: 1. Surgery to remove hematoma: If a patient with cerebral hemorrhage is to have craniotomy, it is generally done by cutting the scalp, opening the skull, and then cutting the dura mater to find the hematoma in the brain and remove it. 2. Intracranial Tumor surgery: If the surgery is performed on intracranial tumor, the tumor tissue underneath needs to be removed as cleanly as possible with the dura mater cut open. Ventriculoperitoneal shunt: There are some special brain surgeries, such as ventriculoperitoneal shunt, which requires the use of ventriculoperitoneal shunt tube, one end of which is left in the ventricular system and the other end is left in the patient’s abdominal cavity, so that the excess cerebrospinal fluid can be drained into the abdominal cavity through the drainage tube and the pressure in the ventricular system can be gradually reduced. The pressure in the ventricular system is gradually reduced.