Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: A single frontal view of the chest was obtained portably . The lungs are well expanded and clear , without focal consolidation , pleural effusion or pneumothorax . Heart size is normal . Mediastinal silhouette and hilar contours are normal . No displaced rib fracture is identified .
    OUTPUT:
    
No acute intrathoracic injury .