Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Supine portable AP view of the chest was provided . There is stable prominence of the mediastinum , which was fully assessed on the prior CTA chest . Lung volumes are low . Right rib cage deformities are chronic . No effusion or pneumothorax is seen . No convincing consolidation , effusion , or pneumothorax is present . There is a rounded calcification overlying the right upper quadrant , stable , likely a large gallstone .
    OUTPUT:
    
Stable mediastinal prominence which has been previously evaluated on CT from ___ . Stable chronic right rib cage deformity .