Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Cardiac silhouette size is mildly enlarged . The mediastinal and hilar contours are unremarkable . Lung volumes are low which causes crowding of bronchovascular structures without overt pulmonary edema . Minimal patchy opacities are seen in the lung bases which may reflect areas of atelectasis . No focal consolidation , pleural effusion or pneumothorax is present . There are no acute osseous abnormalities .
    OUTPUT:
    
Low lung volumes with mild bibasilar atelectasis .