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Multiple imaging timepoints of a right (DSM laterality is opposite conventional radiographs) T4 CVF (arrows) in a single patient. The upper row shows nonsubtracted fluoroscopy images, and the lower row shows DSM images. At time = 0, the contrast column reaches the level of the CVF. One second after, intrathecal contrast starts to fill the CVF, which is better seen at the 2- and 11-second images. The CVF is no longer visible 54 seconds after the initial appearance.
