Fig. 2.

Preoperative MRI of a patient with AICA offender and BA over AICA. The patient was 48-year-old man with right side facial spasm for 2 years. Preoperative MRI shows that AICA compressed facial nerve and BA is over AICA offender (circle) at the REZ. During MVD, we made an effort to make BA movable freely. After surgery, HFS completely resolved but transient facial palsy occurred. AICA : anterior inferior cerebellar artery, REZ : root exit zone, MVD : microsurgical neurovascular decompression, BA : basilar artery.