Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Mild cardiomegaly is chronic . The hilar and mediastinal contours are normal . A left - sided transvenous pacer lead ends in the right atrium . The lungs are well expanded and clear . There is no pleural effusion or pneumothorax .
    OUTPUT:
    
Left - sided pacer ends in the right atrium . No complications .