Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: The heart size is within normal limits . The mediastinal contours demonstrate calcified atherosclerotic disease of the aortic knob . The lungs are mildly hyperinflated but clear . There is no large pleural effusion or pneumothorax . Mild - to - moderate degenerative changes seen in the lower thoracic spine .
    OUTPUT:
    
No acute cardiopulmonary process .