19 三叉神經痛之顯微血管減壓術（microvascular decompression, MVD）主要是要減壓下列何種血管？
上小腦動脈（superior cerebellar artery）
後下小腦動脈（posterior inferior cerebellar artery）
前下小腦動脈（anterior inferior cerebellar artery）
基底動脈（basilar artery）
answer A
The most common cause of nerve compression is by the Superior Cerebellar Artery 
just as the nerve leaves the brain stem. Other causes include nerve compression by tumours and vascular malformations inside the skull and sinus cavities.
just as the nerve leaves the brain stem. Other causes include nerve compression by tumours and vascular malformations inside the skull and sinus cavities.
the trigeminal nerve exit at the level of pons
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