Fig. 6. Sacral SDAVF with arterial feeding from left internal iliac artery of 67-year-old male suffering from progressive numbness, soreness and muscle cramps in bilateral lower extremities for 2 years.

Left internal iliac angiogram in frontal view shows sacral SDAVF (white arrow) draining toward spinal canal via dilated filum terminale vein (arrowheads). Reproduced with permission from Chen et al. Eur J Radiol 2002;44:152-155 (65). SDAVF = spinal dural arteriovenous fistula