Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: The cardiomediastinal and hilar contours are normal . There is no pleural effusion or pneumothorax . Lungs are well - expanded . A small focal opacity in the right lower lung is again noted , similar in location and appearance to that seen on the chest radiograph and CT from ___ but improved compared to chest CT from ___ . No other focal opacities are present . A coronary stent is noted .
    OUTPUT:
    
Small focal right lower lung opacity , similar to that seen in ___ , which may represent chronic scarring from prior infectious process . An acute infectious process is not excluded .