Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: AP and lateral views of the chest were reviewed and compared to the prior study . The leads of a left pectoral pacer follow their expected courses to the right atrium , right and left ventricles . Small left pleural effusion and mild left basilar atelectasis are unchanged . Otherwise , the lungs are clear without pulmonary edema or vascular engorgement . There is no pneumothorax . Moderate - to - severe cardiac enlargement is chronic .
    OUTPUT:
    
1 . Left pectoral pacer leads end in the expected locations of the right atrium , right ventricle and left ventricle . 2 . Small left pleural effusion and left basilar atelectasis are unchanged . 3 . Moderate - to - severe cardiac enlargement is chronic .