Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: The cardiac , mediastinal and hilar contours are within normal limits . Pulmonary vascularity is normal . Lungs are clear . No pleural effusion or pneumothorax is present . There are mild degenerative changes in the thoracic spine . Cholecystectomy clips are present within the right upper quadrant of the abdomen .
    OUTPUT:
    
No acute cardiopulmonary abnormality .