Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: There is persistent visualization of a loculated right basal pneumothorax . A chest drain is in - situ , this appears to been withdrawn slightly when compared to the prior study . There has been interval improvement in the aeration of the right upper lung the right - sided pleural effusion has increased slightly when compared to the prior study . No left - sided pleural effusion seen . Left lung remains grossly clear .
    OUTPUT:
    
Slight interval improvement in the aeration of the right upper lung , slight interval increase in size in the right - sided pleural effusion . Unchanged loculated right basal pneumothorax .