We describe a 39-year-old woman with dural arteriovenous fistula in the region of transverse-sigmoid sinus. A combination approach was designed to treat the fistula but the balloon failed to pass the severely stenosed proximal end of a subtotally isolated sinus. Although successfully occlusion of most feeding arteries from a single arterial injection was achieved, Onyx was found to shift to the outflow tract of the right heart ventricle and then to the lung latterly on six month follow-up.
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