Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: The lungs are slightly hyperexpanded but unchanged since ___ . The cardiomediastinal silhouette , hilar contours and pleural surfaces are normal . There is no pleural effusion or pneumothorax . Configuration of the aortic arch is typical for an aberrant right subclavian artery .
    OUTPUT:
    
No acute cardiopulmonary abnormality .