Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Heart size is normal . Mediastinal and hilar contours are normal . Lungs are clear . Pulmonary vasculature is normal . No pleural effusion or pneumothorax is seen . There are no acute osseous abnormalities identified . Mild degenerative changes are again seen throughout the thoracic spine .
    OUTPUT:
    
No acute cardiopulmonary abnormality .