Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: The lungs are hyperexpanded . There is mild atelectasis at the right base . Cardiomediastinal silhouette and hilar contours are normal . There is no pleural effusion or pneumothorax . There is mild scarring at the lung apices .
    OUTPUT:
    
Mild atelectasis at the right base but no evidence of pneumonia or pulmonary edema . Hyperexpanded lungs may reflect COPD .