Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: AP upright portable chest radiograph is obtained . Patient is status post right lower lobectomy with post-surgical changes again noted at the right lung base . There is no definite sign of pneumonia or CHF . No large effusion or pneumothorax . Known emphysema is evidence by relative upper lobe lucency . Cardiomediastinal silhouette is stable . Bony structures appear intact .
    OUTPUT:
    
Post - surgical changes at the right lung base compatible with prior right lower lobectomy . No signs of superimposed pneumonia .