Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: The heart is normal in size . The mediastinal and hilar contours appear unchanged . The lung volumes are low . Plate - like opacities at the lung bases are most consistent with minor atelectasis or scarring . There is no definite pleural effusion or pneumothorax , however .
    OUTPUT:
    
No evidence of acute disease .