Fig.1

Enhanced computerized tomography (CT) on hospital day 1. A, B Tracheostomy incision was placed at the level of third tracheal ring, and no spinal and arterial deformities were observed. C, D Although the innominate artery was in close proximity of the trachea, no extravasation of contrast media was shown in enhanced CT. D The arrow shows the distance (46 mm) between the posterior surface of the sternum and the anterior surface of the cervical spine