Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: The lung volumes are low , with persistent elevation of the right hemidiaphragm , unchanged since ___ . Bibasilar linear opacities may represent atelectasis or scarring . There is no pleural effusion , pneumothorax , pulmonary edema , or focal consolidation concerning for pneumonia . The cardiomediastinal silhouette is stable . No displaced rib fractures identified .
    OUTPUT:
    
Stable bibasilar atelectasis versus postinflammatory scarring , right greater than left . No radiographic evidence of displaced rib fracture . If clinical concern remains , a dedicated rib series may be helpful .