<s>[INST] My 9 year old son had a persistent cough for three weeks, went to doctor who heard crackles in lung, given azithromycin, still have cough X-ray of chest shows clear lungs but trachea deviated to left, cannot exclude mediastinal mass or adenopathy. Double aortic arch not excluded. Appointment next week, very worried [/INST] Hi,Thank you for asking question on health care magic.Normally trachea is either central or slightly to the right.Deviation of the trachea suggests some pathology.Some thing is pressing on the trachea from right side.As x-ray did not show much information, better go for CT chest.Hope this answer will serve your purposePlease feel free to ask any more queries if requiredTake careDr.M.V.Subrahmanyam MD;DCHAssociate professor of pediatrics </s>