Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Single portable view of the chest is compared to previous exam from earlier the same day at 4 : 19 p .m . performed at an outside institution and prior chest x-ray from ___ . The lungs are clear . Cardiomediastinal silhouette is within normal limits . Multiple old healed right posterior rib fractures are noted . There is no acute displaced rib fracture visualized .
    OUTPUT:
    
No acute cardiopulmonary process .