Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: The patient is status post median sternotomy and CABG . Lung volumes are low with mild to moderate enlargement of the cardiac silhouette re - demonstrated . Mediastinal and hilar contours are unchanged . Crowding of the bronchovascular structures is present without overt pulmonary edema . No focal consolidation , pleural effusion or pneumothorax is present . There is minimal atelectasis at the lung bases . No acute osseous abnormalities seen .
    OUTPUT:
    
Low lung volumes with mild atelectasis at the lung bases . No focal consolidation .