Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Mild cardiomegaly and tortuosity of the thoracic aorta with aortic calcification is unchanged compared to the prior examination . The patient is status post CABG with median sternotomy wires in place . Hilar contours are unremarkable without evidence of overt fluid overload . There is chronic left lung base atelectasis and small effusion similar to prior . Lungs are otherwise clear . No pneumothorax .
    OUTPUT:
    
No acute cardiopulmonary abnormality . Chronic left lung base atelectasis and effusion .