Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: The heart is top normal in size . The hilar and mediastinal contours are normal . Patient is status post right lower lobectomy with postsurgical changes . An area of increased opacification in the right lung base likely represents scar formation and appears unchanged from prior examination . Otherwise , the lungs are clear . There are no pleural effusions , pneumothorax , focal consolidations or pulmonary edema . Degenerative changes are noted along the lower thoracic spine .
    OUTPUT:
    
Postsurgical changes at the right lung compatible with prior right lower lobectomy and scar formation . No signs of superimposed pneumonia .