Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: A left pectoral pacemaker seen with transvenous leads in the right ventricle and left coronary sinus . The lungs are clear . The heart is moderately enlarged . No pneumothorax . Mild basilar atelectasis .
    OUTPUT:
    
Left pacemaker with transvenous leads in the right ventricle and left coronary sinus . No pneumothorax .