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for NED in PBI. Spinal dural arteriovenous fistulas (SDAVFs) are rare vascular malformations. Digital subtraction angiography is the modality of choice to demonstrate the malformation before endovascular embolization or open surgical repair. Angiographically occult SDAVFs have been previously reported. Surgical considerations in SDAVFs with misleading angiography findings have not yet been assessed. A retrospective evaluation of charts and imaging files of patients operated on for SDAVF in 2018-2019 at a single institution was performe