Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Single frontal radiograph demonstrates stable position of a left pectoral cardiac pacer / AICD with leads terminating in the right atrium and right ventricle . The device partially obscures a portion of the left mid lung . Median sternotomy wires appear intact . There is evidence of prior coronary arterial bypass surgery . The heart is normal in size . The thoracic aorta is moderately tortuous . There is atherosclerotic calcification in the aortic arch . The lungs are clear , despite low volumes . There is no pneumothorax , pulmonary edema , or pleural effusion .
    OUTPUT:
    
No acute cardiopulmonary process .