Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Cardiac silhouette size is normal . The aorta is mildly tortuous . Mediastinal and hilar contours are unremarkable . Lungs are hyperinflated but clear without focal consolidation . No pleural effusion or pneumothorax is identified . Mild degenerative changes are seen in the thoracic spine .
    OUTPUT:
    
No acute cardiopulmonary abnormality .