Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: The heart is normal in size . The mediastinal and hilar contours appear within normal limits . Minimal streaky opacity at the left lung base suggests very minor atelectasis . Otherwise , the lung fields appear clear . There is no pleural effusion or pneumothorax . The thoracic spine curves slightly to the right .
    OUTPUT:
    
No evidence of acute cardiopulmonary disease .