Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Sternal brackets and fusion devices are again re - demonstrated , in unchanged position . Low lung volumes are present . This accentuates the size of the cardiac silhouette which is moderately enlarged . The patient is status post aortic valve replacement . The aorta remains tortuous . Crowding of the bronchovascular structures is present without overt pulmonary edema . Minimal patchy bibasilar airspace opacities likely reflect atelectasis . Blunting of the right costophrenic angle appears chronic , and may be due to a small right pleural effusion . No pneumothorax is present . Remote right - sided rib fracture is present .
    OUTPUT:
    
Low lung volumes with probable bibasilar atelectasis . Probable small right pleural effusion .