Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: The lungs are hyperexpanded and clear . Mediastinal contours , hila , and cardiac silhouette are normal . There is trace right pleural thickening . No pleural effusion or pneumothorax . Surgical clips in the right upper quadrant are consistent with prior cholecystectomy .
    OUTPUT:
    
No evidence of pneumonia .