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Figure 3. (a) Anteroposterior image of 3D volume-rendering MR angiography shows the right-sided aortic arch (RA), which divides the first two branches of the right common carotid (RC) and the right subclavian artery (RS). Then, the left subclavian (LS) and left common carotid arteries (LC) are derived from the third branch of the left innominate artery (arrow), which is eventually considered the small left arch (PA, pulmonary artery). (b) Deep left anterior oblique image of 3D volume-rendering MR angiography shows that the left subclavian (LS) and left common carotid artery (LC) are derived from the left arch (black arrow) locating proximal to the aneurysm (white arrow) (RC, right common carotid artery; RS, right subclavian artery; PA, pulmonary artery). (c) Deep right posterior oblique image of 3D volume-rendering MR angiography shows tapering and aneurysm (arrow) of the left arch (RA, right arch; PA, pulmonary artery; RC, right common carotid artery; RS, right subclavian artery; LC, left common carotid artery; LS, left subclavian artery).
