Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: There are low lung volumes . Cardiac , mediastinal and hilar contours are normal . Minimal hazy opacities at the lung bases may reflect atelectasis , though infection can not be completely excluded . No pleural effusion or pneumothorax is seen , and there are no acute osseous abnormalities .
    OUTPUT:
    
Low lung volumes limit assessment of the lung bases . Minimal hazy opacities at the lung bases may reflect atelectasis , though infection can not be completely excluded .