Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Heart size is normal . The cardiomediastinal silhouette and hilar contours are unremarkable . Biapical scarring . Lungs are otherwise clear . Pleural surfaces are clear without effusion or pneumothorax . There are unchanged tracheal calcifications .
    OUTPUT:
    
No acute cardiopulmonary abnormality .