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Hemifacial spasm caused by multiple vascular attachments due to remote compression effects of a dermoid cyst in the cerebellar hemisphere: illustrative case

Kento Hirayama, Takafumi Tanei, Takenori Kato, Toshinori Hasegawa, Eiji Ito, Yusuke Nishimura, and Ryuta Saito

posterior fossa are extremely rare, and they are located close to occipital bone at the asterion, intradural space, and cerebellar hemisphere. 3–8 These cases are summarized in Table 1 . Clinical symptoms of patients with these lesions included headache, ataxia, hearing loss, gait disturbance, dizziness, vertigo, and trigeminal neuralgia. The mechanisms of onset of these symptoms were mainly direct compression or increased intracranial pressure. Even though there is normal cerebellar tissue between the lesion and the cranial nerve, remote effects due to indirect