• Wouter I Schievink, Marcel M Maya, Ray M Chu, Tiffany G Perry, Franklin G Moser, Rachelle B Taché, Vikram S Wadhwa, and Ravi S Prasad.
• Department of Neurosurgery, Cedars-Sinai Medical Center, Los Angeles, California, USA.
• Neurosurgery. 2023 Aug 1; 93 (2): 473479473-479.

BackgroundPostoperative spinal cerebrospinal fluid (CSF) leaks are common but rarely cause extensive CSF collections that require specialized imaging to detect the site of the dural breach.ObjectiveTo investigate the use of digital subtraction myelography (DSM) for patients with extensive extradural CSF collections after spine surgery.MethodsA retrospective review was performed to identify a consecutive group of patients with extensive postoperative spinal CSF leaks who underwent DSM.ResultsTwenty-one patients (9 men and 12 women) were identified. The mean age was 46.7 years (range, 17-75 years). The mean duration of the postoperative CSF leak was 3.3 years (range, 3 months to 21 years). MRI showed superficial siderosis in 6 patients. DSM showed the exact location of the CSF leak in 19 (90%) of the 21 patients. These 19 patients all underwent surgery to repair the CSF leak, and the location of the CSF leak could be confirmed intraoperatively in all 19 patients. In 4 (19%) of the 21 patients, DSM also showed a CSF-venous fistula at the same location as the postoperative dural tear.ConclusionIn this study, DSM had a 90% detection rate of visualizing the exact site of the dural breach in patients with extensive postoperative spinal CSF leaks. The coexistence of a CSF-venous fistula in addition to the primary dural tear was present in about one-fifth of patients. The presence of a CSF-venous fistula should be considered if CSF leak symptoms persist in spite of successful repair of a durotomy.Copyright © Congress of Neurological Surgeons 2023. All rights reserved.

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