Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Frontal and lateral chest radiographs demonstrate well expanded and clear lungs bilaterally . Cardiomediastinal and hilar contours are unremarkable . Pleural surfaces are normal . There is no pleural effusion or pneumothorax . Thoraolumbar scoliosis is mild to moderate .
    OUTPUT:
    
Normal chest radiograph . No explanation for persistent cough .