Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: The heart is not enlarged . There is mild unfolding of the aorta . The cardiomediastinal silhouette is otherwise within normal limits . There is mild bilateral lower lobe atelectasis . No CHF , focal infiltrate or effusion is detected . No pneumothorax identified . No free air seen beneath the diaphragm .
    OUTPUT:
    
Minimal bibasilar atelectasis . Otherwise , no acute pulmonary process identified .