Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Frontal upright and lateral chest radiographs demonstrate hyperinflated lungs . Heart is normal in size , and cardiomediastinal contour is within normal limits . Lungs are clear . There is no pleural effusion and no pneumothorax .
    OUTPUT:
    
No significant changes compared to the prior study and no evidence of pneumonia .