Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Frontal and lateral views of the chest demonstrate slightly lower lung volumes than prior , but clear lungs . The cardiomediastinal and hilar contours are stable . There is no pleural effusion or pneumothorax . Pleural surfaces are unremarkable .
    OUTPUT:
    
Normal chest radiograph . Specifically , no evidence of pneumonia .