Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Cardiac , mediastinal and hilar contours are within normal limits . Heart size is normal . The aorta is mildly unfolded . The pulmonary vasculature is normal . Lungs are clear . No pleural effusion or pneumothorax is present . Mild degenerative changes are noted in the thoracic spine . Numerous left axillary clips are present . Circular radiopaque devices are noted within the anterior chest wall bilaterally , compatible with tissue expander devices .
    OUTPUT:
    
No acute cardiopulmonary abnormality .