Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: The lungs are hyperexpanded and clear . Compared to the prior chest radiograph pulmonary edema has completely resolved . There is no focal opacity or pneumothorax . A tiny right pleural effusion is possible . The aortic knob is calcified . The heart size is normal . There is no free intra-abdominal air .
    OUTPUT:
    
No pneumonia . No free air .