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CSF-venous fistulas — initially described in 2014 — are a significant cause of spontaneous intracranial hypotension. Dynamic lateral decubitus digital subtraction and/or CT myelography typically show a hyperdense paraspinal vein. In case of a central drainage toward the internal vertebral venous plexus, it is the “hyperdense basivertebral vein” which should be searched for carefully.

The “hyperdense basivertebral vein” sign: another marker of a CSF-venous fistula