Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Lung volumes are slightly low . The heart size is mildly enlarged . Mediastinal and hilar contours are unremarkable . The pulmonary vasculature is not engorged . The lungs are clear . No pleural effusion or pneumothorax is seen . No acute osseous abnormality is identified .
    OUTPUT:
    
No acute cardiopulmonary abnormality .