Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Cardiomediastinal silhouette and hilar contours are normal . There has been interval placement of a left pectorally implanted pacemaker with a single lead terminating in the right ventricle without evidence of pneumothorax . The previously appreciated nodular opacity along the left heart border is not clearly visualized on either views of today 's study as the patient is turned and the nodule is obscured by the cardiac silhouette . Lungs are otherwise clear . There is no pleural effusion .
    OUTPUT:
    
1 . Left pectoral pacer in appropriate position with lead in the right ventricle without evidence of pneumothorax . 2 . Previously appreciated nodule on the left heart border is not clearly visualized on today 's study . Further evaluation with dedicated chest CT is recommended . Results were entered into the ___ online critical result database .