Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: A left - sided pacemaker generator with a single lead overlying the right atrium and 2 leads overlying the right ventricle is in appropriate position . The cardiomediastinal and hilar contours are normal . There is no evidence of pneumothorax or pleural effusion . There is no evidence of focal consolidation . There is stable calcification of the aortic arch .
    OUTPUT:
    
Pacemaker and leads in appropriate position . No other significant change from the prior study .