Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: The lungs are well expanded and clear . The cardiac silhouette is mildly enlarged . The mediastinal silhouette shows aortic calcifications . The hilar contours and pleural surfaces are normal . No pleural effusion or pneumothorax is present . Cholecystectomy clips are noted in the right upper quadrant , unchanged . A hyperdense focus is noted overlying the L1 vertebral body , which could represent a bone island , unchnaged from prior . A healed rib fractures is unchanged in the left hemithorax .
    OUTPUT:
    
No acute intra-thoracic process .