Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: The patient is status post median sternotomy and CABG . Heart size remains mildly enlarged . Mediastinal and hilar contours are unremarkable . Lung volumes are low with streaky opacities in the lung bases , more pronounced on the left , compatible with areas of atelectasis . No focal consolidation , pleural effusion or pneumothorax is seen . Multilevel degenerative changes are again noted in the thoracic spine with flowing anterior osteophytes compatible with DISH .
    OUTPUT:
    
Low lung volumes with bibasilar atelectasis .