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Figure 18.   Takayasu arteritis. Dynamic subtraction MR angiogram obtained with two separate injections of gadopentetate dimeglumine shows aortic occlusion from the upper thoracic descending aorta to the abdominal aorta (solid arrows). A long aortoaortic bypass graft is clearly seen (solid arrowheads). The stricturelike region corresponds to an anastomosis (open arrow). Also note the stenosis of the left carotid artery (open arrowhead).