Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: The patient has had prior median sternotomy and CABG . No complications of the sternal wires . Interval insertion of a left - sided defibrillator with the tip in the right ventricle . No pneumothorax . The lungs are clear . Mild - to - moderate cardiomegaly . No pleural effusions .
    OUTPUT:
    
Left - sided defibrillator with the tip in the right ventricle in standard position . No pneumothorax .