This is a normal variant of the arteries Mentioned above. They both come off of a common larger artery. This is of no critical concern. Good luck.
Answered 4/23/2023
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Most likely the way you were born. Different than most as the Left common caroric usually comes off aorta separately from artery to the left arm. You might have s "steal" response when you exercise your Left arm as this can draw blood away from you L brain. If BP the same in both arms & no TIAs/dizziness with L arm exercise likely OK. Google branches off arota and look at images. Dicuws
Answered 4/22/2023
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