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74-year-old woman with new nocturnal pulsatile tinnitus (case 7).
A and B, Colocalized arterial spin-labeling (A) and time-of-flight (B) MRA images show that signal intensity and flow-related enhancement (arrows) can be helpful for recognizing dural arteriovenous fistulas.
C and D, Colocalized arterial spin-labeling (C) and time-of-flight (D) MRA images show signal intensity and flow-related enhancement (arrows) also occur in physiologic internal jugular vein reflux.
