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Tracheal obstruction. CT in a 13-year-old patient shows a severe tracheal obstruction. Tracheal narrowing, often due to impression from the crossing bracheocephalic (innominate) artery, increases with age. Note the position of the brachiocephalic artery anterior to the trachea (arrows). Cervico-thoracic spine moves forward while a severe pectus carinatum compresses backward.
