Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Frontal and lateral views of the chest . Sternotomy wires and mediastinal clips are stable . Heart size and cardiomediastinal contours are normal . The upper zone predominant emphysematous changes are similar to prior with stable linear opacities in the lower lungs . No focal consolidation , pleural effusion , or pneumothorax . Multilevel degenerative changes are seen within the thoracic spine .
    OUTPUT:
    
No acute cardiopulmonary process . Severe emphysematous changes .