Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: The heart is normal in size . The mediastinal and hilar contours appear within normal limits . There is no pleural effusion or pneumothorax . The lungs appear clear . There is no evidence for rib fracture . A previously reported sternal fracture based on CT imaging is not well demonstrated on this examination .
    OUTPUT:
    
No radiographic evidence of injury . Nonvisualization of sternal fracture reported on prior CT .