Fig. 8. 60-year-old man presenting with bilateral leg soreness for several months was diagnosed with SEAVF.

A. Axial T2-weighted spinal MR image shows engorged flow void structure (white arrow) at left anterolateral epidural space at L3 level, which is probably epidural venous lake. B. Angiography of left lumbar artery at L3 shows arteriovenous shunts (hollow arrow) that drain into prominent, diamond-shaped epidural venous plexus (white arrows) cross midline and delayed intradural venous drainage (black long arrows). Turning point (small black arrows) where retrograde drainage of intradural vein arises from epidural venous plexus is clearly exhibited. SEAVF = spinal extradural arteriovenous fistulas