Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: There is an opacity at the right lung base which appears unchanged from at least ___ . This may represent atelectasis / scarring in the setting of an elevated right hemidiaphragm . Minimal atelectasis / scarring at the left base is also unchanged . Apparent bilateral perihilar opacities are also unchanged . No new focal consolidation , pleural effusion or pneumothorax . No pleural effusions or pneumothorax . No CHF . Heart size is normal . No acute osseous abnormalities identified .
    OUTPUT:
    
Right lung base opacity has been present since at least ___ . Minimal left base atelectasis is also stable . No new focal consolidation , pleural effusion or pneumothorax .