Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Right - sided Port - A - Cath tip terminates in the proximal right atrium , unchanged . The patient is status post median sternotomy and aortic valve replacement . Low lung volumes are present . Mild to moderate enlargement of the cardiac silhouette is re - demonstrated . Mediastinal and hilar contours are unchanged . There is crowding of the bronchovascular structures without overt pulmonary edema . Minimal atelectasis is noted in the lung bases . No focal consolidation , pleural effusion or pneumothorax is visualized . There are no acute osseous abnormalities .
    OUTPUT:
    
Low lung volumes with mild bibasilar atelectasis .