Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Lung volumes are low . Allowing for this difference in volumes , there is no significant change compared to ___ . No large pleural effusion or pneumothorax . The cardiomediastinal silhouette is stable . No displaced rib fracture is identified .
    OUTPUT:
    
No evidence of acute cardiopulmonary process or displaced rib fracture . No pneumothorax .