Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Large left apical pleural opacity / pleural collection is re - demonstrated , similar in extent . Prominence of the left hilum is again seen . There is patchy left base opacity ; left base retrocardiac opacity present previously although the extent appears slightly increased as compared to the prior study , superimposed infection , aspiration not excluded .
    OUTPUT:
    
Large left apical pleural opacity / pleural collection is re - demonstrated , similar in extent . Prominence of the left hilum is again seen . There is patchy left base opacity ; left base retrocardiac opacity present previously although the extent appears slightly increased as compared to the prior study , superimposed infection , aspiration not excluded .