Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Heart size is at the upper limits of normal , but not frankly enlarged . The mediastinal and hilar contours are within normal limits . Probable minimal bibasilar atelectasis . However , no focal infiltrate is identified . No CHF or effusion . No pneumothorax detected . .
    OUTPUT:
    
Heart size at upper limits of normal . Possible minimal bibasilar atelectasis . Otherwise , no acute pulmonary process identified .