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Fig. 1B. —70-year-old man with type 2b dural arteriovenous fistula in
left sigmoid sinus. Axial CTA image obtained at level of cavernous portion of
internal carotid artery shows arterial contrast intensity within left vein of
Labbé (arrow) caused by backflow from fistula. Superior
sagittal sinus shows lower venous intensity (arrowhead).
