Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: The patient is status post median sternotomy , CABG , and aortic valve replacement . The cardiac silhouette size and configuration is unchanged , as is the mediastinal and hilar contours . There are low lung volumes , which results in minimal bibasilar atelectasis and crowding of the bronchovascular structures . No focal consolidation , pleural effusion , or pneumothorax is present . There are mild degenerative changes of the thoracic spine . Cholecystectomy clips are noted in the upper abdomen .
    OUTPUT:
    
No acute cardiopulmonary abnormality . Mild bibasilar atelectasis in the setting of low lung svolumes .