Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: The lungs are hyperexpanded , with biapical hyperlucency , flattening of the diaphragms , and widening of the retrosternal clear space . There is no focal consolidation . No pleural effusions , pneumothorax , or pneumomediastinum . Heart size is normal . Aorta is tortuous and unfolded .
    OUTPUT:
    
Hyperexpanded lungs . No acute process .