Chest radiograph obtained in a 30-year-old man after the initial trauma presentation. The radiograph shows a right-sided pneumothorax, associated rib fractures, and mediastinal emphysema, with the collapsed lung on the right in the dependent position (ie, the "fallen" lung sign).
From: Magu S, Agarwal K, Lohchab SS, Agarwal S. Fallen lung sign (on chest radiograph). J Trauma 2011; 70:1012. DOI:
10.1097/TA.0b013e31819adb51. Copyright © 2011. Reproduced with permission from Wolters Kluwer Health. Unauthorized reproduction of this material is prohibited.