Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: The heart is normal in size . The mediastinal and hilar contours appear stable . Blunting of posterior costophrenic sulci suggests a trace pleural effusion , at least on the right side , but possibly bilateral . Mild pleural thickening at each lung apex appears unchanged . The lungs appear otherwise clear . Bony structures are unremarkable .
    OUTPUT:
    
Findings which may suggest trace pleural effusion ; otherwise unremarkable .