Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Cardiac silhouette size is normal . The aorta is tortuous but unchanged . The mediastinal and hilar contours are similar . Pulmonary vasculature is normal and the lungs are clear without focal consolidation . No pleural effusion or pneumothorax is seen . There are mild degenerative changes of the lower thoracic spine . Upper abdominal surgical clips are again demonstrated .
    OUTPUT:
    
No acute cardiopulmonary abnormality .