I. Reasons for repair Cranial trauma, brain tumor and other diseases caused by craniotomy cranial defect diameter of 3 cm or more, no contraindications should be performed cranial repair. Patients often have heavy insecurity and other thought burdens, and can cause headache, dizziness, fear of vibration and other syndromes. The longer the skull defect, the higher the incidence of skull defect syndrome and secondary brain damage. In order to restore the cranial cavity confinement, maintain the physiological intracranial pressure stability, reduce the cranial defect syndrome and improve the prognosis. Timing of surgery 1.About 2 months after cranial defect. 2.The pressure at the site of skull defect is not high; if hydrocephalus exists, hydrocephalus ventral shunt surgery can be performed at the same time. 3.No infection, ulcer and other factors that are not conducive to the healing of the incision. Fourth, repair materials At present, we mainly use CT three-dimensional reconstruction technology of digital skull shaping technology is a revolutionary progress of skull repair surgery, CT three-dimensional reconstruction is based on the condition of the patient’s skull defect, simulating the natural shape of the skull, after CT data processing, medical three-dimensional reconstruction, surface drawing of the natural surface of the skull, computer graphics image aided design and digital manufacturing of titanium metal, etc. 5 procedures, using the results of 3D CT examination, a personalized titanium skull for repairing the defect is precisely designed and prefabricated for the patient, which is successfully fixed on the patient’s defective head during the surgery, this technology realizes the precise combination of titanium skull and defective part, realizes effective mechanical protection of brain tissue, achieves good treatment effect, also reduces the patient’s pain, the treatment risk is greatly reduced, and the patient The postoperative recovery period is shortened, and the patient can return to work and integrate into society more quickly. Although cranial repair surgery is no longer a difficult procedure in the field of neurosurgery, and the risk factor is decreasing, the suitability of this type of surgery for each patient should be determined according to the specific situation of the patient. If the skull defect does not exceed 3 cm in diameter, the site is protected by temporal muscles in the temporal region, and the patient is elderly, the movement is small and the possibility of re-trauma is small, then there is always a certain risk of surgery, and titanium mesh also has disadvantages such as expensive and unsatisfactory thermal insulation. Therefore, it is not necessary to make skull repair surgery again. V. Post-operative precautions Routine application of antibiotics to prevent infection, removal of drainage tube in 1~2 days, and removal of stitches in 10~12 days. VI. Is the surgery risky? The surgery method is quite mature, and we do more than 60 skull defect repairs every year.