Inclusion and exclusion criteria.
Diagnosis of the paraspinal AVF, spinal epidural AVF, spinal dural AVF, perimedullary AVF, radicular AVF, or filum terminale AVF
Diagnosis of the intramedullary spinal cord AVM, SAMS, or VVF
Incomplete or absent spinal angiographic imaging
Abbreviations: AVF, arteriovenous fistula; AVM, arteriovenous malformation; SAMS, spinal arteriovenous metameric syndrome; VVF, vertebro-vertebral fistula.