Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Single frontal view of the chest demonstrates interval placement of a right subclavian approach central venous catheter with tip in the lower SVC . There is no pneumothorax . A left pectoral cardiac pacer is stable in location with the leads terminating in the right atrium and right ventricle . The lung volumes are low , accentuating mild pulmonary edema . There is retrocardiac opacity and blunting in the left costophrenic angle which may reflect atelectasis and a small effusion .
    OUTPUT:
    
Appropriate central line positioning without pneumothorax . Other findings unchanged since preceding exam .