Fig 1. 22-year-old man with intradural perimedullary SCAVF.

A, Sagittal fast spin-echo T2-weighted MR image (left) and postgadolinium T1-weighted image (right) show multiple enlarged pial vessels along the surface of the cord. Intrinsic increased signal intensity centrally within the spinal cord (left) and abnormal enhanced cord (right) extend from the lower thoracic levels to the conus medullaris.

B, Oblique coronal multiprojection volume-reconstruction images with different plane projections show the fistula (left, white arrowheads [type A, perimedullary SCAVF]) at the lower L2 spine level supplied by the mildly enlarged anterior spinal artery (large arrow). Multiple engorged outflow veins draining both cephalic and caudal directions are also noted (small arrows). Curved planar reformation image (right bottom) delineates the aorta (Ao) and anterior spinal artery feeder from the left T8 intercostal artery.

C, Conventional angiography of the left T8 intercostal artery in early (left) and late (right) phases, anteroposterior view, shows similar depiction of Fig 1B. The posterior spinal artery (black arrowheads) was also injected via the left T8 intercostal artery but did not supply the fistula.