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CSF venous fistula visualized best on decubitus CTM. Axial prone CTM image (A) shows possible increased density of a spinal segmental vein (arrow). Axial image (B) from a decubitus CTM performed after dynamic myelography on a subsequent day shows increased filling of the segmental veins (arrow), helping to confirm the diagnosis of CVF. Note the increased density of the left lateral thecal sac due to decubitus positioning.
