Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Lung volumes are low . Within differences in technique , the cardiac , mediastinal and hilar contours appear unchanged . Vague opacities at the lung bases can probably be attributed to minor atelectasis . Otherwise , the lungs appear clear . There are no pleural effusions or pneumothorax .
    OUTPUT:
    
Low lung volumes with suspected minor atelectasis , but no definite evidence of acute cardiopulmonary disease .