Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Cardiac silhouette size is top normal . Mediastinal and hilar contours are within normal limits . Pulmonary vasculature is normal . Minimal blunting of the left costophrenic sulcus appears unchanged , and may be reflective of pleural thickening and scarring . Lungs are otherwise clear without focal consolidation , pleural effusion or pneumothorax . Mild degenerative changes are seen in the thoracic spine .
    OUTPUT:
    
No acute cardiopulmonary abnormality .