Suggestive chest x-ray findings include the following: Widened mediastinum (high sensitivity except among older patients) 1st or 2nd rib fracture Obliteration of the aortic knob Deviation of the trachea or esophagus (and thus also any nasogastric tube) to the right Depression of the left mainstem bronchus Pleural or apical cap Hemothorax, pneumothorax, or pulmonary contusion However, some of these suggestive chest x-ray findings may not be present immediately.