Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Heart size is normal with dense mitral annular calcifications again seen . Mediastinal and hilar contours are unchanged . The pulmonary vasculature is not engorged . Lung volumes are low with patchy opacities in the lung bases , not substantially changed from the prior study , and most likely suggestive of atelectasis . No focal consolidation , pleural effusion , or pneumothorax is present . Hypertrophic changes are re - demonstrated in the thoracic spine .
    OUTPUT:
    
Low lung volumes with bibasilar atelectasis .