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With this image, it is very difficult to comment. It appears normal to me. I would advice you in such case to get a Chest X-ray done, that will rule out in case any bony deformity is there.
If you are a smoker then this is a possibility that this kind of deformity might be due to Emphysematous changes in the chest.
Get a Chest X-ray for the best confirmatory diagnosis.
Share my opinion with your doctor.
I hope it helps.
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