Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: AP single view of the chest has been obtained with patient in semi-upright position . Comparison is made with the next preceding similar study obtained five hours earlier during the same day . Evidence of left - sided pleural effusion obliterating the entire left - sided diaphragm as before . Aeration of left upper lobe area has slightly improved . Right hemithorax unremarkable as before . A Dobbhoff line is identified , reaching well below the diaphragm and the tip of the line having a caudal direction before it escapes the lower image border . In comparison with the next preceding study , the position of the Dobbhoff line is completely unchanged . Previously described right internal jugular approach central venous line terminates in unchanged position in the lower SVC .
    OUTPUT:
    
Mildly improved aeration of left upper lobe but persisting sizable pleural effusion and probably atelectasis in left lower lobe area . Dobbhoff line in unchanged position .