Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Portable AP chest radiograph . Median sternotomy wires are intact . The right hemidiaphragm is persistently elevated with minimal bibasilar atelectasis . There is no pulmonary edema . Mild cardiomegaly is chronic . There is no pneumothorax .
    OUTPUT:
    
No acute cardiopulmonary process .