Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: The cardiomediastinal silhouette is unchanged . There is no focal consolidation or pulmonary edema . There is no pneumothorax or substantial pleural effusion . Chronic displaced fourth rib fracture again noted . Chain sutures are noted bilaterally along the lung periphery possibly secondary to prior surgery .
    OUTPUT:
    
No evidence of pneumonia .