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Fig. 3A. —Aneurysm of 2-weeks' duration in New Zealand white rabbit. Anteroposterior digital subtraction angiogram with catheter positioned in aortic arch obtained immediately before sacrifice shows saccular aneurysmal cavity at former origin of right common carotid artery. Aneurysmal cavity is approximately 6 mm wide and 8 mm high. Note radiopaque spheres measuring from 2 to 6 mm in diameter. Aneurysmal neck lies along apex of curve of brachiocephalic and subclavian arteries. Also note right vertebral artery (curved arrow), left common carotid artery (long straight arrow), and faint opacification of left subclavian artery (short straight arrow).