Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: The lung volumes are low , limiting evaluation . Hazy opacification of the left base is likely atelectasis . There is no focal airspace opacity , small pulmonary edema , pleural effusion , or pneumothorax . The mediastinal contours are somewhat wide , though likely post - surgical after a prior CABG . The heart size is normal . Sternal wires are intact . Mediastinal clips are noted .
    OUTPUT:
    
No acute cardiopulmonary process in this limited exam .