Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: The lungs are minimally hyperexpanded , possibly due to respiratory effort . The lungs are clear . The cardiomediastinal silhouette , hilar contours and pleural surfaces are normal . There is no pleural effusion or pneumothorax .
    OUTPUT:
    
Mildly hyperexpanded lungs , but no evidence of acute cardiopulmonary abnormality .