Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Extensive mediastinal and bilateral hilar lymphadenopathy is not appreciably changed since the most recent radiograph of ___ , and has been present as far back as ___ . This is in keeping with the known history of sarcoidosis . There are no new parenchymal abnormalities to suggest fibrosis . The lungs are clear . There is no pleural effusion or pneumothorax . Bones and soft tissues are unremarkable .
    OUTPUT:
    
Stable mediastinal and bilateral hilar lymphadenopathy is in keeping with the known history of sarcoidosis . There is no radiographic evidence of new fibrosis .