Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: The lungs are hyperexpanded but clear . The cardiomediastinal silhouette and hilar contours are normal . No pleural effusion or pneumothorax is present . Sternal wires are intact . An aortic valve is unchanged and thoracic spinal hardware is noted , unchanged .
    OUTPUT:
    
No acute intrathoracic process .