Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: AP upright and lateral views of the chest provided . Left chest wall Port - A - Cath is again noted with leads extending into the region of the right atrium and right ventricle . Lungs are clear . On the lateral view only , retrocardiac opacity is noted though there is no correlate opacity in the frontal per projection . Thus , findings may reflect atelectasis . Cardiomediastinal silhouette is normal . No large effusion or pneumothorax . Bony structures are intact .
    OUTPUT:
    
No acute intrathoracic process .