Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Lungs are clear with no areas of focal consolidation , pleural effusion , or evidence of pneumothorax . The cardiomediastinal silhouette is within normal limits . The pleural surfaces are unremarkable . An old rib fracture in the right sixth rib along the mid clavicular line is observed , otherwise skeletal structures are unremarkable .
    OUTPUT:
    
No evidence of malignancy or infection .