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听神经瘤在进展过程中常有面神经及三叉神经受累症状,而手术摘除听神经瘤时常易损伤面神经。听神经瘤根据其体积和症状可分为四期: 一期:肿物位于内耳道之内。二期:肿物超出内耳门进入桥小脑角,但尚未接触三叉神经或脑干,直径约20mm。以上两期为纯耳科类型,仅表现纯耳蜗和前庭症状。三期:肿物侵及桥小脑角并累及三叉神经、脑干等。四期:肿物累及Ⅸ、Ⅹ、Ⅺ、Ⅲ脑神经、脑干等,常伴有颅内压增高。后两期为耳神经学类型、有耳及神经学症状。任何病期面神经均能受累,尤其是三期和四期。面神经是面听束的组成部分,手术时常发现
Acoustic neuroma often has facial nerve and trigeminal nerve involvement in the process of progress, and it is easy to damage the facial nerve when surgically removing the acoustic neuroma. Acoustic neuromas can be divided into four phases according to their volume and symptoms: Phase I: The mass lies within the inner ear canal. Phase II: The mass protrudes beyond the inner ear into the cerebellopontine angle but has not yet been exposed to the trigeminal nerve or brainstem and is approximately 20 mm in diameter. The above two phases were of pure ear type and showed only pure cochlear and vestibular symptoms. Phase III: The tumor invaded the cerebellopontine angle and involved the trigeminal nerve, brain stem and so on. Phase IV: Tumor involving IX, X, XI, III brain, brain stem, etc., often accompanied by increased intracranial pressure. The latter two phases are otolaryngologic types, eared and neurological symptoms. Facial nerve can be affected during any disease period, especially in the third and fourth phases. The facial nerve is an integral part of the facial tuft, often found during surgery