Which radiographic sign on chest imaging is strongly associated with traumatic aortic injury in blunt chest trauma?

• A. Elevated diaphragms
• B. Pneumothorax
• C. Cardiac tamponade
• D. Widened mediastinum

Answer: (D)

A widened mediastinum on chest imaging is the strongest clue that the thoracic aorta may have been injured in blunt trauma. When the aorta tears or is disrupted, blood collects in the mediastinal space, causing the mediastinal silhouette to expand beyond normal width. This sign directly points to mediastinal hematoma from a potential aortic injury, and it prompts urgent further imaging, typically CT angiography, to confirm the diagnosis and plan management. While pneumothorax or cardiac tamponade can occur with chest trauma, they reflect other injuries and aren’t as specifically associated with traumatic aortic disruption; elevated diaphragms are non-specific and not a reliable indicator of this injury.