Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Frontal and lateral views of the chest were obtained . Lucency in the upper lung zones , right more than left , is compatible with severe emphysema . Linear opacities in the lower lungs are likely due to compression of vessels with areas of linear scarring and a bandlike scar in the right middle lobe , similar to the prior CT . There is no focal consolidation , pleural effusion , or pneumothorax . Heart size is normal . Median sternotomy wires are intact after CABG . Cardiac and mediastinal silhouette and hilar contours are stable .
    OUTPUT:
    
No pneumonia , edema , or effusion . Severe emphysema is similar to ___ .