Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Again identified are nondisplaced rib fractures of the left posterior second through sixth ribs . Since the prior radiograph , there has been no significant change . No evidence of callus formation is yet seen . The osseous structures are otherwise unremarkable . Stable bibasilar interstitial opacifications reflect the patient 's known pulmonary fibrosis . A small amount of atelectasis is noted . The cardiomediastinal silhouette is mildly enlarged and stable from prior exams . There is no pleural effusion or pneumothorax .
    OUTPUT:
    
1 . Stable appearance of the left second through sixth rib fractures . 2 . Stable bibasilar pulmonary fibrosis .