Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: The heart appears at the upper limits of normal size , perhaps with a prominent left atrial appendage , but unchanged . There is mild unfolding of the thoracic aorta . The mediastinal and hilar contours appear stable . The chest is hyperinflated . New blunting of the right costophrenic sulcus may suggest a very small pleural effusion , or alternatively , mild atelectasis with volume loss . Elsewhere , the lungs appear clear .
    OUTPUT:
    
No evidence of acute disease .