Postoperative anteroposterior chest x-ray. A Black arrow indicates the distal tip of the endotracheal tube. The distal tip of the endotracheal tube was below the first thoracic vertebra (T1) level. Considering that the level of the larynx is at sixth cervical vertebra (C6) level in adults, the balloon of the endotracheal tube might be located just below the vocal cords.