Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: There is mild chronic elevation of the left hemidiaphragm . Aside from minimal bibasilar atelectasis , the lungs are clear . Mild cardiomegaly is unchanged . Tortuosity and ectasia of the thoracic aorta is unchanged . The mediastinal contours are otherwise normal . There are no pleural abnormalities . Loss of height of several thoracic vertebral bodies is not significantly changed .
    OUTPUT:
    
Mild bibasilar atelectasis . Otherwise , no acute cardiac or pulmonary process .