Fig 7.

Comparison of MR angiography with catheter angiography in a patient with a SDAVF. A, Sagittally oriented T2-weighted image displaying the signal intensity voids around the spinal cord, which are characteristic of the vascular pathology. B, The sagittal MIP displays the craniocaudal extent of the dilated perimedullary vein draining the fistula. C, The magnified MR angiographic image depicts the arterial feeder of the fistula (arrow) and the dilated perimedullary vein, together with the ASA (arrowhead). D, The early phase image of the catheter angiography examination verified the vertebral location of the fistula. Note that only the catheter angiography images can reveal the small network of vessels of the fistula (D) and depict the dynamic drainage pattern (E), whereas MR angiography reveals better the spatial extent of the venous drainage (B).