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FIG 1. Aortic arch digital subtraction arteriogram, right posterior oblique projection. No vertebral arteries are present. Normal origins of the subclavian and carotid arteries can be seen.
FIG 2. Right common carotid artery digital subtraction arteriogram, lateral projection. Origin of a proatlantal artery from the internal carotid artery (type 1) at C2 can be seen (black arrow). The vessel courses dorsally above C1 (arrowhead) and enters the skull via the foramen magnum (white arrow).
FIG 3. Left common carotid artery digital subtraction arteriogram, lateral projection. Origin of a proatlantal artery from the internal carotid artery (type 1) at C2 can be seen (arrow). The vessel courses dorsally above C1 (arrowhead).
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