Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: AP upright portable chest radiograph obtained . A double - barrel Port - A - Cath is again seen residing over the right axilla with catheter tip extending to the level of the low SVC . There is a retrocardiac opacity with air - fluid level likely representing known large hiatal hernia . Left basal linear density is likely scarring . No effusion or pneumothorax . Old right upper rib deformities are noted .
    OUTPUT:
    
Stable hiatal hernia . No pneumonia .