Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: PA and lateral views of the chest were provided . Patient is known to have pulmonary fibrosis , honeycombing and subpleural fibrosis , better assessed on the prior CT scan . Allowing for differences in modality , the overall pattern of pulmonary fibrosis appears similar . There is no convincing evidence for superimposed pneumonia , though a subtle pneumonia would be difficult to exclude . The cardiomediastinal silhouette appears grossly stable . The rightward deviation of the trachea is stable from prior exam , likely reflecting retraction from asymmetric pulmonary fibrosis in the right upper lung . No free air below the right hemidiaphragm .
    OUTPUT:
    
Extensive pulmonary fibrosis , similar in overall pattern from prior exam . No definite signs of superimposed pneumonia , though subtle pneumonia difficult to exclude .