Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: The heart appears borderline in size and a mildly bulging posterior contour suggestive of left atrial enlargement . The mediastinal and hilar contours appear within normal limits . There is no pleural effusion or pneumothorax . The lungs appear clear .
    OUTPUT:
    
No evidence of acute cardiopulmonary disease .