Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Single frontal view of the chest was obtained . Heart size and cardiomediastinal contours are stable . Right upper lobe mass containing a radiopaque fiducial marker is unchanged . The lungs are otherwise clear . No pneumothorax , or substantial pleural effusion .
    OUTPUT:
    
No pneumothorax . Unchanged right upper lobe mass containing a radiopaque fiducial marker .