Plain film radiographs of the chest ordered from the ED are indicated in stable patients to provide contributory information in the diagnostic process of health complaints potentially involving the chest. The radiographic findings on plain film chest serve as a useful screening measure to confirm or rule out the presence of various chest conditions. Interpreting plain film radiographs is similar to identifying an object by examining only the shadow of the object. Unlike advanced imaging methods (CT, ultrasound, MRI), plain film radiographic abnormalities are often subtle. Plain film radiograph can be utilized to diagnose pneumonia, atelectasis, pulmonary edema, lung abscess, tuberculosis etc., in the lungs, and cardiomegaly, congestive heart failure, congenital heart disease etc., in the heart. Plain radiographs are also used to diagnose aortic dissection and aortoesophageal syndrome, pneumomediastinum, thymus enlargement, and fractures such as clavicle fractures and rib fractures.