Figure 1 :(A) Magnetic resonance imaging scans of the cervical segment of spinal cord (Dec, 2006). It revealed the arteriovenous malformation (arrow) located at the C1-C2 level, and there also existed vessel void signal (arrow head) at the dorsal aspect of the spinal cord; and the axial image revealed the lesion was an intramedullary arteriovenous malformation Figure 1B: Head magnetic resonance imaging (Dec, 2006), which revealed the cerebral arteriovenous malformation located at the medial surface of the right occipital lobe