The risks of cranial bone replacement surgery are usually minor. A few patients may experience seizures or bleeding. Cranioplasty is a secondary neurosurgical procedure, mainly used for skull defects caused by traumatic brain injury, brain hemorrhage and other diseases, and the procedure will not cause damage to brain tissue, so the risk is not great. 1. Epileptic seizures: a few patients may have epileptic seizures due to the stimulation of brain tissue during surgery. At this time, you should follow the doctor’s instructions and choose anti-epileptic drugs to be taken orally according to your condition. 2. Bleeding: as the process of cranioplasty may require extensive scalp peeling, bleeding will occur during the operation, and generally no obvious abnormality will occur if the bleeding is stopped in time. In a few patients, blood may collect in the epidural, requiring hematoma removal. Because of the wide variation between patients, it is advisable to consult your doctor about the specific risks of cranioplasty.