Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: The cardiomediastinal and hilar contours are normal . The lungs are clear . There is no pleural effusion or pneumothorax . Examination of the thoracic spine shows no compression deformity and no changes compared to the ___ chest radiograph . Additionally , subtle contour irregularities at the costovertebral junctions of the posterior aspect of the right upper ribs suggest old healed injury , also unchanged from ___ chest radiograph .
    OUTPUT:
    
No acute cardiopulmonary process ; no evidence of acute thoracic spine or rib fracture .