Figure 7a. AVM of the spinal cord. (a) Sagittal T2-weighted MR image shows flow voids along the surface of the spinal cord (arrowheads) and a serpentine vascular structure with flow voids at the C6-7 level (arrow). (b) Sagittal contrast-enhanced three-dimensional MR angiogram demonstrates a nidus (thick arrow) with a large feeding vessel (thin arrow).