Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Lung volumes are low . Allowing for that , the cardiac , mediastinal and hilar contours are probably unchanged and increased densities at lung bases can probably be attributed to crowding of bronchovascular structures . The lungs appear otherwise clear . There is no pleural effusions or pneumothorax .
    OUTPUT:
    
Low lung volumes but no convincing evidence for acute cardiopulmonary disease .