Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Frontal and lateral chest radiographs demonstrate a normal cardiomediastinal silhouette and unchanged hyperinflated lungs which are clear . There is no pleural effusion or pneumothorax . Sternal and anterolateral left 7th rib fractures are better evaluated on recent CT chest .
    OUTPUT:
    
No evidence of pneumonia .