Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: The cardiac silhouette size is normal . Mediastinal and hilar contours are unremarkable . Pulmonary vasculature is normal and the lungs are clear . No pleural effusion or pneumothorax is seen . There are mild degenerative changes in the thoracic spine .
    OUTPUT:
    
No acute cardiopulmonary process .