Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: The lungs are hyperinflated with flattening of the hemidiaphragms consistent with COPD . Biapical scarring is noted . Redemonstrated is a large opacity overlying the right lower lobe , consistent with right lower lobe pneumonia . As compared to the chest x-ray dated ___ , the right lower lobe is increasingly opacified . A small right pleural effusion is also noted . The right upper lobe and left lung are essentially clear without additional focal consolidation , pneumothorax , or pulmonary edema . The cardiomediastinal silhouette is stable .
    OUTPUT:
    
Right lower lobe pneumonia . Severe emphysema .