Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: The lungs are overall slightly better aerated . A small to moderate right pleural effusion is decreased . Bibasilar airspace opacities , left greater than right , may represent atelectasis , edema , or an infectious process , overall improved . There is no pneumothorax . The heart is top - normal in size , unchanged . A dual - chamber left pectoral pacemaker and its leads project in unchanged location . Extensive mediastinal surgical clips are unchanged . Probable chronic middle right clavicular fracture is unchanged .
    OUTPUT:
    
Slight interval improvement in lung aeration with decreased but persistent small to moderate right pleural effusion and left lung airspace opacification , potentially representing atelectasis , edema , or infection .