The reason why “facial spasm” has to be “craniotomy” also starts from the pathogenesis of facial spasm: the normal blood vessels in the pontocerebellar horn region become naturally tortuous with age, and very few patients’ blood vessels, due to their congenital position or bending tendency, will compress the facial nerve in the exocerebral region (REZ) at a certain age. If the local pressure on the facial nerve reaches a certain level, long-term arterial pulsatile compression will cause local damage to the nerve fibers in the facial nerve root exiting the brainstem area (i.e. demyelination) and multiple pseudosynapses between adjacent nerve fibers, “current shorts” and multiple Therefore, the microvascular decompression (MVD) of the facial nerve root, which can not only relieve the compression of the nerve by blood vessels but also completely preserve the function of blood vessels and nerves, has been highly recommended by many neurosurgeons. The microvascular decompression (MVD) has been highly recommended by neurosurgeons. Microvascular decompression is a procedure that removes the external compression of the facial nerve by implanting a cushion (e.g., resin wool) to keep the responsible blood vessels away from the facial nerve, thereby removing the root cause of facial muscle spasm and curing it with the natural repair of facial nerve fibers.