Endotracheal tube

The endotracheal intubation tube is an artificial tubular device inserted into the tracheal lumen to maintain airway patency.

On a CT scan, it appears as a hyperattenuating (bright) ring with an air-filled (dark) lumen, positioned centrally or eccentrically within the trachea. Its distal tip should ideally be located within the thoracic trachea, cranial to the tracheal bifurcation.