Three types of malpositioning can occur: one outside the trachea (esophageal), and two within the trachea: too shallow, or too deep (endobronchial). Esophageal intubation results in hypoxemia and inflation of the stomach. Too-shallow placement of the ETT can result in inadvertent extubation, especially with manipulation of head and neck. Endobronchial intubation occurs when the ETT is advanced into a mainstem bronchus, which results in hypoxia and the potential for barotrauma in the hyperventilated lung.