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Diagrams of a spinal cord arteriovenous malformation with various venous drainage pathways. A, Nidus AVM drained by a single radicular vein. B, Nidus AVM with additional drainage via the anterior spinal vein and perimedullary veins: 1) nidus, 2) anterior spinal artery, 3) radiculomedullary artery, 4) radiculopial artery, 5) radicular vein, 6) aorta, 7) vertebral body, 8) anterior spinal vein, 9) perimedullary venous drainage.
