Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: The heart is normal in size . The mediastinal and hilar contours are unchanged . There is no pleural effusion or pneumothorax . Slight subpleural thickening at the right lung apex suggests minor scarring . New blunting of the right costophrenic sulcus suggests there may be a trace pleural effusion , but not substantial . The lungs appear clear . There is no pneumothorax . Mild elevation of the right hemidiaphragm is unchanged . Bony structures are unremarkable .
    OUTPUT:
    
No evidence of acute disease .