This case is a nice example of a supine hemothorax on a trauma chest radiograph being identifiable as a generalized increase in hemithorax density compared to the contralateral side.  

CT Findings

• Bilateral hemothorax, right greater than left
• mild atelectasis adjacent to the hemothoraces
• small pulmonary contusion and traumatic pneumatocele right lung base
• multiple bilateral anterobasal incomplete rib fractures
• right T10 transverse process and vertebral body fracture with adjacent locules of gas
• trace bilateral pneumothorax anterobasally (very tiny!)