Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Right moderate pleural effusion is unchanged since ___ but improved since ___ . This pleural effusion has already been assessed by thoracocentesis . Left lung is unremarkable except for a basilar atelectatic band . Patient is known with hiatal hernia . Surgery was done for scoliosis . There is no pneumothorax .
    OUTPUT:
    
Right moderate pleural effusion is unchanged since ___ but improved since ___ . It has already been assesed with centesis .