Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: PA and lateral views of the chest . Again seen is the biapical calcified scarring compatible with prior granulomatous disease and emphysematous changes involving mainly the apices . Mild chronic interstitial changes are seen in the lower lobes bilaterally , better assessed on the prior CT . There is an opacity in the left lower lobe which may represent a superimposed pneumonia . No pleural effusion or pneumothorax is seen . The cardiomediastinal silhouette is normal . The median sternotomy wires and mediastinal clips are stable . Clips are seen in the right upper quadrant . There is no free air . The osseous structures appear unremarkable .
    OUTPUT:
    
Left lower lobe opacity concerning for pneumonia .