Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: The heart size is normal . The mediastinal and hilar contours are unremarkable . The lungs are hyperinflated with lucency of the lung apices and attenuation of the pulmonary vascular markings compatible with severe bullous emphysema . No focal consolidation , pleural effusion or pneumothorax is identified . There are degenerative changes in the thoracic spine with anterior bridging osteophytes .
    OUTPUT:
    
Severe bullous emphysema but no acute cardiopulmonary abnormality .