Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Lung volumes are slightly decreased compared to the prior exam . This causes exaggeration of the cardiac silhouette size which is likely unchanged and top normal . Mediastinal and hilar contours are unremarkable accounting for low lung volumes . There is crowding of the bronchovascular structures but no overt pulmonary edema is present . Minimal atelectasis is seen in the lung bases . No pleural effusion or pneumothorax is identified . No acute osseous abnormalities seen .
    OUTPUT:
    
Low lung volumes with mild bibasilar atelectasis .