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? (A)上小腦動脈(superior cerebellar artery) (B)後下小腦動脈(posterior inferior cerebellar artery) (C)前下小腦動脈(anterior inferior cerebellar artery) (D)基底動脈(basilar artery)