Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Hyperinflated with flattening of the diaphragms and increased retrosternal clear space compatible with COPD . Linear opacities within the lung bases may reflect areas of scarring or subsegmental atelectasis . The cardiac , mediastinal and hilar contours are normal . No focal consolidation , pleural effusion or pneumothorax is seen . Multiple remote bilateral rib fractures are demonstrated . No acute osseous abnormality seen .
    OUTPUT:
    
COPD . Subsegmental atelectasis or scarring in the lung bases . No acute cardiopulmonary abnormality otherwise demonstrated .