A 28-year-old man, unconscious, was brought to the hospital immediately after a major car accident.
A CT-scan was performed, revealing a high-density elongated structure located in the trachea, in a dependent position, measuring 24mm x 6mm.
Patient was re-evaluated a few hours later, revealing migration of the high-density foreign body structure to the right bronchial tree, positioned in the origin of the right lateral basal bronchus.
Based on the context, morphology and density of the foreign body, it was assumed it was a tooth.
Patient underwent rigid bronchoscopy, with removal of the foreign body and confirmation of the suspected nature - an aspirated tooth.
Foreign-body (FB) aspiration is a potential harmful situation requiring early detection and intervention. 
Although more common in children, adults are also at risk of FB aspiration, especially after trauma with loss of consciousness and of airway protection. Other risk factors include intoxication, intubation or dental procedures. 
Clinical features of FB aspiration most frequently include an acute onset of symptoms such as dyspnea, coughing, wheezing, stridor and cyanosis. Rarely, it can be asymptomatic, which could delay the diagnosis.
Chest X-ray is usually the first imaging exam performed, although in many cases aspirated FB is radiolucent. Additionally, it can also show hyperinflation of one lung or lobe, atelectasis, mediastinal shift or pneumomediastinum. Expiratory films are useful on cooperative patients, demonstrating air-trapping on the affected side, and decubitus view could also be used, especially in children or non-cooperative patients, acquired with the suspected side down, showing lack of collapse of the air-trapped lung. 
Computer tomography (CT) is superior to x-ray, allowing the detection of smaller or non-opaque FBs and its possible complications.
Bronchoscopy has a dual role in diagnosis and treatment, allowing the removal of the FB. 
Flexible bronchoscope is more suitable for small and distally located FBs, and rigid bronchoscope for bigger FB. If unsuccessful, open thoracotomy is an alternative, although rarely performed nowadays due to the effectiveness of endoscopic techniques. 
Written informed patient consent for publication has been obtained.
Differential Diagnosis List
Other foreign bodies
Calcified tracheal/bronchial lesion