Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Left - sided cardiac pacing device with dual leads following their expected courses to the right atrium and ventricle . There is no pneumothorax or pneumomediastinum . Mediastinal and hilar contours are normal . Heart size is normal . Subcentimeter nodular opacity at the right base is unchanged since the prior chest radiograph and has been previously attributed to a nipple shadow in the absence of a lung abnormality in this region on interval CT abdomen of ___
    OUTPUT:
    
Left - sided cardiac pacing device with dual leads following their expected courses to the right atrium and ventricle .