Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: New left chest wall pacer - defibrillator has leads terminating in the right atrium , right ventricle and coronary sinus or tributaries . There is no pleural effusion or pneumothorax . The heart is top - normal , unchanged . The lungs are normally expanded . Prior opacity at the left base is essentially resolved .
    OUTPUT:
    
New left chest wall pacemaker - defibrillator . No pneumothorax .