Figure 3 :(a) Left vertebral angiogram (Dec,2006): Post-embolization angiogram with microsphere (300-500 mm), blood flow of the spinal arteriovenous malformation decreased obviously compared with the former angiogram in Figure 2; (b and c) Bilateral vertebral angiogram (Dec, 2006) demonstrated the spinal arteriovenous malformation had been removed totally after surgery by C1-C2 laminectomy