Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: PA and lateral views of the chest provided . Superior retraction of the left pulmonary hilum is unchanged reflecting prior left hilar mass resection . A left upper lobe nodule is again noted . Background emphysema is seen without convincing signs of pneumonia . No large effusion or pneumothorax . No signs of congestion or edema . Imaged bony structures are intact . No free air below the right hemidiaphragm .
    OUTPUT:
    
1 . Left upper lobe nodule . 2 . Emphysema . 3 . No signs of pneumonia .