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Fig. 2A. —29-year-old woman with spontaneous regression of right transverse and sigmoid dural arteriovenous fistula without therapy. Source image of first 3D time-of-flight (TOF) MR angiography shows findings of multiple high-intensity curvilinear or nodular structures adjacent to sinus wall (small arrows) and high-intensity areas in venous sinus (large arrow) at right transverse and sigmoid sinuses. Dural arteriovenous fistula of transverse and sigmoid sinuses was confirmed by digital subtraction angiography (not shown).