The objective of the proposed study is to investigate the diagnostic accuracy of ED POCUS in pediatric traumatic thoracic injuries including traumatic pneumothorax, hemothorax, lung contusion, rib fractures, and pulmonary edema (from submersion injury). This will be a prospective, multicenter, observational study of children 0-21 years of age presenting to the participating pediatric emergency departments for suspected traumatic thoracic injury. Results of POCUS will be compared to that of chest X-ray, final clinical diagnosis, computed tomography (CT) or magnetic resonance imaging (MRI). Study hypotheses are that POCUS is highly accurate (90-95%) when compared to chest X-ray, and moderately accurate (\ 80%) when compared to CT or MRI in diagnosing these conditions.