Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Interval insertion of a left - sided defibrillator with the tip in the right ventricle . Moderate cardiomegaly . No pneumothorax or pleural effusion . Chronic elevation of the right hemidiaphragm .
    OUTPUT:
    
Left - sided defibrillator tip in the right ventricle . No pneumothorax .