Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: The heart size is normal . Mild aortic knob calcifications are noted . Mediastinal and hilar contours are within normal limits . Lungs are clear without focal consolidation . No pleural effusion or pneumothorax is seen . There are mild degenerative changes in the thoracic spine as well as within both acromioclavicular joints .
    OUTPUT:
    
No acute cardiopulmonary abnormality .