Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: There is re- demonstration of a left - sided dual lead pacer in unchanged position . Median sternotomy wires are in place . Tortuosity of the aorta is unchanged with atherosclerotic calcifications at the knob . There is mild prominence of the central pulmonary vasculature unchanged from prior without frank pulmonary edema . Trace atelectasis at the lung bases . Old right - sided rib fractures are noted . Pleural surfaces are clear without effusion or pneumothorax .
    OUTPUT:
    
No acute cardiopulmonary abnormality . Chronic changes as above .