Microvascular decompression surgery requires a craniotomy. Because of the importance of the area involved in the surgery and the depth of the surgical field, microvascular decompression surgery is a level IV neurosurgical procedure, and the surgery carries a certain degree of risk. Microvascular decompression is adapted as the preferred modality for the surgical treatment of cranial nerve disorders such as trigeminal neuralgia and facial spasms. The general surgical procedure of microvascular decompression is to take a posterior craniotomy, then cut the cerebellar hemisphere to expose the roots of the trigeminal nerve, facial nerve and other cranial nerves out of the brainstem, and use a spacer to isolate the small blood vessels that are compressing the nerves, so that cranial nerve disorders can be eradicated. Since the surgical area involves the brainstem, vertebral arteries, and important nerve tissues such as the facial and auditory nerves and the trigeminal nerve, the surgery carries certain risks, such as facial paralysis, hearing loss, as well as brainstem damage, cerebral hemorrhage, etc., and may even be life-threatening.