Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: A left - sided pectoral pacer and dual leads are in expected position . The cardiomediastinal and hilar contours are within normal limits . The aorta is tortuous and calcified at the aortic arch . The right lung is clear . Scattered left basal opacities suggest atelectasis . No large pleural effusion or consolidation is identified .
    OUTPUT:
    
No evidence of pneumothorax . Left basal opacity suggests atelectasis . If there is any clinical concern for infection , this could represent an area of pneumonia .