Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Frontal and lateral views of the chest demonstrate no subdiaphragmatic free air . The cardiomediastinal silhouette is unremarkable . The lungs are clear and well aerated . There is no pneumothorax or pleural effusion .
    OUTPUT:
    
Unremarkable chest radiograph . No pneumoperitoneum .