FIG 3. Case 17. A 50-year-old woman with dAVF in the left transverse sinus.

A, Lateral intra-arterial DSA of the left ECA shows obstruction of the left transverse sinus (arrows). Abnormal vessels (arrowheads) are observed around the obstructed left transverse sinus. Severity of the drainage was grade 2 (26%–50% of cortical veins on angiography).

B, Enhanced 3D MP-RAGE image shows abnormal dilated veins at the base of the cerebrum (arrow) and in the posterior fossa (arrowhead). Bilateral posterior cerebral arteries were identified on other sections (not shown).