Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Lines and tubes are grossly unchanged . Again seen is dense opacity along the upper left chest wall , not significantly changed compared with the most recent prior film , but probably slightly improved compared with ___ at 18 : 53 . There is also persistent increased retrocardiac opacity , though the left hemidiaphragm remains visible . Hazy density at the left base laterally is in part due to overlying materials . No gross left effusion . There has been interval clearing of opacity that was previously seen at the right base .
    OUTPUT:
    
As above . .