Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: One frontal view of the chest . Left pacemaker is seen with transvenous leads in the right atrium and right ventricle in appropriate position . Sternotomy wires and mediastinal clips are again seen . Aortic knob calcifications are stable . Cardiomegaly is stable . No pneumothorax , pleural effusion or mediastinal widening . Lungs are clear .
    OUTPUT:
    
Left pacemaker leads are in appropriate position . No pneumothorax or mediastinal widening , or evidence of hemothorax .