Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Allowing for differences in technique and projection , no significant change in the appearance of the chest is noted since the recent examination . Lung volumes are low . A pigtail catheter seen in the right upper thorax . There is persistent opacity a in the entire right hemithorax with persistent loculated fluid . Again seen is mild indistinctness of the pulmonary vasculature .
    OUTPUT:
    
No significant change since prior examination .