Delayed formation of a symptomatic de novo low-flow perimedullary arteriovenous fistula two years after successful treatment of a high-flow perimedullary arteriovenous fistula
1. Division of Interventional Neuroradiology, The Johns Hopkins Hospital, Baltimore, MD 21287, United States;2. Division of Pediatric Neurosurgery, Johns Hopkins All Children''s Hospital, St. Petersburg, FL 33701, United States