Spinal Arteriovenous Lesions

Spinal arteriovenous lesions represent a heterogeneous set of pathologic entities. As our general understanding of these lesions has evolved, so have the classification systems clini‐ cians use to describe them. Historically, the most common classification of arteriovenous fistulas (AVF) has been the Type I-IV classification. More recently these lesions have been described from an anatomical and physiologic perspective.