it can be normal variation. but a variation of more than 10 mm HG is considered to be significant and needs to be investigated.
there are lots of possibilities of this variation which cant be discussed here.
CT of arch of aorta is the best investigation to be done
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Disclaimer : The content is not intended to be a substitute for professional medical advice, diagnosis, or treatment. Always seek the advice of your physician or other qualified health provider with any questions you may have regarding your medical condition. Never disregard professional medical advice or delay in seeking it because of something you have read on this website.
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