Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: PA and lateral radiographs of the chest demonstrate several surgical clips in the left superior mediastinum , unchanged from the preceding radiograph . The lungs are clear without focal consolidation , pleural effusion , or pneumothorax . The pulmonary vasculature is not engorged . The mediastinal and hilar contours are within normal limits . The cardiac silhouette is normal in size . No acute rib fracture is seen ; however , the left lower lateral ribs are excluded from view on these images . The thoracic vertebral body heights are maintained without compression fracture .
    OUTPUT:
    
No acute intrathoracic pathology .