Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: The lungs remain relatively hyperinflated . Right basilar opacity is seen minimally increased as compared to the prior study and underlying pneumonia is not excluded . The left lung is without significant interval change . No pleural effusion or pneumothorax . The cardiac and mediastinal silhouettes are stable .
    OUTPUT:
    
COPD . Subtly increased opacity at the right lung base , underlying pneumonia not excluded .