Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: The lungs remain hyperexpanded , though clear . There is no confluent consolidation , pulmonary edema or pleural effusion . Mediastinal and hilar contours are within normal limits . The heart size remains top normal . Aortic knob calcifications are unchanged . There is no pneumothorax .
    OUTPUT:
    
No acute cardiopulmonary process