Hemifacial spasm (Hemifacial Spasm, HFS) for paroxysmal hemificialspasm involuntary tics, usually, only one side of the face. In 1875, Schul
Hemifacial spasm (Hemifacial Spasm, HFS) for paroxysmal hemificialspasm involuntary tics, usually, only one side of the face. In 1875, Schulitze et al. Reported a patient with HFS who had a "cherry" size of the basilar artery at autopsy. It is known that about 80% to 90% of HFS is due to the presence of vascular compression of the facial nerve in the brainstem. The clinical data showed that the anterior inferior cerebellar artery (AICA) and the posterior inferior cerebellar artery (PICA) were the main factors leading to HFS, while the superior cerebellar artery (SCA). SCA is known from the basilar artery and posterior cerebral artery at the junction, take the most constant line, while PICA and AICA are relatively large variation, which is easy to form vascular loops or ectopic compression of the facial nerve; another large artery artery lost and other variations such as vertebral artery and basilar artery may lead to HFS formation of facial nerve compression. The HFS is due to arterial pulsatile compression caused by the recent study show that HFS lead to a single vein vascular compression of the facial nerve also, and the blood vessels in two or more persons to form a joint facial nerve compression, which affects the prognosis of HFS operation in a certain extent. For hemifacial spasm patients before surgery, MRI can show the relationship between facial nerve and vascular compression of the responsibility of the good, predictive selection and curative effect for the treatment method is very necessary.