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CSF venous fistula visualized best on decubitus CTM. Axial prone CT myelogram (A) shows subtle filling of a network of paraspinal veins (arrow) lateral to the nerve root and in the adjacent spinal segmental vein (arrowhead). Axial image (B) from a decubitus CTM performed after dynamic myelography on a subsequent day shows increased filling of the lateral veins (arrow) and segmental vein (arrowheads), making the CVF much more conspicuous.
