vibrations may be felt over the ventral cervical trachea. On X-ray, dramatic narrowing of the trachea is evident. The site of the collapse is often at the thoracic inlet and has also been found at the tracheal bifurcation and mid-trachea. | vibrations may be felt over the ventral cervical trachea. On X-ray, dramatic narrowing of the trachea is evident. The site of the collapse is often at the thoracic inlet and has also been found at the tracheal bifurcation and mid-trachea. |