A dural spinal arteriovenous malformation with epidural venous drainage: a case report.

Thoracolumbar spinal angiomas are typically fed by intercostal or lumbar arteries [1] and are drained exclusively by perimedullary veins [2]. Rarely, internal iliac artery branches may supply a spinal arteriovenous malformation (AVM). Epidural venous drainage has not been reported [2-4]. Only eight cases of spinal A VMs fed by internal iliac branches have been described in the literature [2, 5-11]. We report a lumbosacral A VM supplied by a lateral sacral artery and drained by left epidural veins that was successfully treated by isobutyl 2-cyanoacrylate (bucrylate) embolization . The unique venous drainage of this A VM raises controversial questions about the pathophysiology of the spinal angiomas.