Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: AP upright portable chest radiograph is obtained . The lungs are clear and well expanded . No signs of pneumonia or CHF . No pleural effusion or pneumothorax . Cardiomediastinal silhouette is normal . Bony structures are intact . Old left rib deformity again noted .
    OUTPUT:
    
No signs of pneumonia .