Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Frontal and lateral radiographs of the chest were acquired . There is redemonstration of a left - sided pacemaker with associated right atrial and right ventricular leads , appropriately positioned . The lungs are clear . The heart size is within normal limits . The mediastinal contours are normal . There are no pleural effusions . No pneumothorax is seen .
    OUTPUT:
    
No acute cardiac or pulmonary process .