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Fig. 1A. —70-year-old man with type 2b dural arteriovenous fistula in left sigmoid sinus. Axial CT angiographic (CTA) image shows high-intensity filling in left sigmoid sinus (white arrow); note adjacent pacchionian granulation. Contrast intensity is same as that of basilar artery (black arrow). Contralateral sinus structures show less intense contrast intensity (arrowhead).