Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: The heart is normal in size . The contour corresponding to left atrial appendage appears mildly prominent . The mediastinal and hilar contours are otherwise unremarkable . There is no pleural effusion or pneumothorax . The lungs appear clear . The visualized thoracolumbar spine demonstrates mild S - shaped curvature .
    OUTPUT:
    
No evidence of acute cardiopulmonary disease . Possible enlargement of the left atrial appendage .