Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: PA and lateral chest radiographs . Bony bridging of the posterior sixth through ninth ribs has occured since prior radiograph five months ago . However , the fractures have not fused . There is no focal consolidation , pleural effusion , or pneumothorax . The cardiomediastinal silhouette is stable .
    OUTPUT:
    
Bony bridging , but non-fusion of right posterior rib fractures . No acute cardiopulmonary process .