Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: The lungs are normally expanded with exception of mild bibasilar atelectasis , left greater than right . Heart size is normal . The mediastinal and hilar contours are normal . There is no pleural effusion or pneumothorax . The thoracic aorta is tortuous as before . Median sternotomy wires appear intact .
    OUTPUT:
    
No acute cardiopulmonary abnormality . Mild bibasilar atelectasis .