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FIG 4. Images in a 64-year-old man with a 13-month history of progressive lower trunk and lower-extremity numbness and mild bowel and bladder urgency. Far left, Sagittal T2-weighted fast spin-echo image shows increased T2 signal intensity and mild swelling involving the lower spinal cord and conus, with prominent flow voids over the dorsal surface of the cord (arrows). Middle left and middle right, MRA performed with a bolus of gadolinium-based contrast agent. Thin, 6-mm sagittal (middle left) and coronal (middle right) MIP images at 2 mm increments through the spinal canal confirm a dilated coronal venous plexus along the dorsal surface of the cord (arrow) and show a prominent medullary vein extending from the left L1 foramen (arrowhead). Far right, Catheter angiogram confirms a spinal dural AVF at L1 on the left side.
