Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Lung volumes are within normal limits and unchanged compared to the prior study . There are persistent bibasilar opacities with ring shadows consistent with bronchiectasis . Appearances are consistent with the patient 's known pulmonary fibrosis . Difficult to exclude superimposed infection however the the appearances are grossly similar when compared to the prior study . No pleural effusion or pneumothorax seen . The visualized bony structures are unremarkable in appearance .
    OUTPUT:
    
Persistent bibasilar opacities consistent with the patient 's known pulmonary fibrosis . Difficult to exclude superimposed infection however no convincing evidence of superimposed infection on the current study .