Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: The heart is borderline in size . The mediastinal and hilar contours appear within normal limits . The lungs appear clear . There is no pleural effusion or pneumothorax . Streaky opacity at the left base suggests minor atelectasis . Otherwise , the lungs appear clear . No rib fractures identified . There is mild S - shaped curvature to the thoracolumbar spine and the bones are possibly demineralized to some extent .
    OUTPUT:
    
No evidence of acute cardiopulmonary disease .