Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: The lung volumes are low . The cardiac , mediastinal and hilar contours appear unchanged including moderate tortuosity along the descending thoracic aorta . The streaky opacity in the left lower lung is most consistent with minor unchanged scarring . Otherwise , the lungs appear clear . There no pleural effusions or pneumothorax . The patient is status post left shoulder replacement .
    OUTPUT:
    
No evidence of acute cardiopulmonary disease .