Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: A moderate to large loculated left pleural effusion has slightly improved since yesterday 's radiograph , although some of this apparent change may be due to upright PA technique . A small right effusion is seen on the lateral projection . Cardiomegaly is stable . A right internal jugular catheter and left pigtail pleural drain are in unchanged positions .
    OUTPUT:
    
Mild improvement in moderate to large left pleural effusion . Small right effusion .