Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: PA and lateral views of the chest were obtained . The patient is known to have underlying pulmonary fibrosis , which is better seen on the prior CT scan . Overall , there is no superimposed pneumonia or CHF . No pleural effusion or pneumothorax . Overall , pattern of interstitial fibrosis is stable . Heart and mediastinal contours are unchanged . Bony structures appear intact .
    OUTPUT:
    
Changes compatible with chronic interstitial lung disease without superimposed pneumonia or CHF .