Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: PA and lateral views of the chest were provided . The patient is known to have extensive pulmonary fibrosis , which in comparison with a prior chest radiograph from ___ appears similar in overall extent and severity . No definite evidence for a superimposed pneumonia . No effusion or pneumothorax is seen . Overall , cardiomediastinal silhouette appears grossly stable . The bony structures are intact .
    OUTPUT:
    
Extensive pulmonary fibrosis , similar to examinations .