Facial nerve palsy If the severed end of the facial nerve can be found during the operation, anastomosis of the severed end will be carried out (with tissue adhesive); on the contrary, anastomosis of the facial nerve – hypoglossal nerve should be carried out. Mu Linsen, Department of Neurosurgery, Guangzhou Brain Hospital 2, cerebrospinal fluid leakage Cerebrospinal fluid leakage from the incision is usually caused by poor surgical suture, placing the drain at the retention line suture is not deep and dense; generally by strengthening the suture 1, 2 stitches, delayed removal of stitches and pressure bandage and other treatments can be avoided. Cerebrospinal fluid otorhinolaryngologic leakage is the result of poor closure of the mastoid airspace after opening, and the closure of the mastoid airspace should be preceded by scraping away the mucosa in the airspace, and then closed with a small piece of fascia and bone wax. Labyrinthine approach surgery must be allowed to fill the soft tissue to the mastoid cavity open gas chamber and the entrance of the tympanic sinus; posterior sigmoid sinus approach, be careful to grind off the dura mater damaged during the posterior lip of the internal auditory canal, which is the gateway to the cerebrospinal fluid, the wall of the internal auditory canal grinding off the opening of the gas chamber is more difficult to be supplemented with a 30 ° angle endoscopy, to find the deeper in the gas chamber, to avoid the occurrence of cerebrospinal fluid leakage. Cerebrospinal fluid otorhinolaryngology leakage is usually cured by re-surgical repair and correction of anemia. 3. Intracranial hematoma Postoperative hematoma formation is mainly related to incomplete intraoperative hemostasis, premature postoperative awakening of the patient, and elevated postoperative blood pressure, and age is also an important factor. Before closing the operative cavity, we must carefully check for bleeding and confirm that there is no bleeding and no blood seepage before closing the cavity. The patient should not be awake immediately after surgery, but should be kept sedated for about 12 hours. For patients with signs of increased intracranial pressure after surgery, after excluding the influence of anesthesia factors and slow recovery of consciousness after surgery, CT examination should be carried out in time to detect hematoma and operate as soon as possible, so as to reduce the rate of disability and mortality. The 48 hours after surgery is the critical period for bleeding or not, and should be closely observed clinically. Posterior cranial nerve palsy The incidence of cranial nerve palsy in the posterior group is not high, and all of them are associated with large tumors. The possible reasons are that the brain stem is shifted by long-term compression, the tension of supplying blood vessel wall increases, and after decompression, it temporarily loses the ability to regulate, and ischemia or edema of the brain stem occurs. Therefore, for those who already existed before the operation or consider the possibility of paralytic symptoms after the operation, the removal of tracheal intubation should be delayed until the patient is fully awake, and a gastric tube should be placed at an early stage in order to avoid choking of vomitus or diet into the trachea, which may cause pulmonary infection. It has been suggested that intraoperative hypotension may predispose to postoperative bulbar palsy. The latter group of cranial nerve palsy, on the other hand, usually recovers well unless the nerve is dissected or severely damaged. Postoperative bacterial meningitis is thought to be caused by intraoperative contamination, which may be related to the lack of strict aseptic operation and long operation time. It is generally believed that aseptic meningitis is related to the use of bone wax to fill the open mastoid airspace during the operation. Hearing preservation Hearing preservation depends on the normalization of the internal auditory artery, cochlear structure and auditory nerve. Whether hearing can be preserved is related to various factors such as preoperative hearing, tumor growth site, tumor size, choice of surgical procedure and intraoperative monitoring, which are still being explored at present.