Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Since the prior chest x-ray on ___ , there has been interval removal of the right - sided chest tube . There is a well circumscribed oval - shaped opacity in the right lung base that is new / more prominent than the prior chest x-ray . The right lower lobe nodule was recently evaluated by a PET - CT on ___ . There is a linear area of scarring in the prior chest tube tract . There is also a small right pleural effusion . Stable appearance of cardiomediastinal silhouette . No acute osseous abnormalities .
    OUTPUT:
    
1 . Interval removal of the right - sided chest tube . No pneumothorax . 2 . Well circumscribed right lung base opacity likely represents a ___-___ pleural effusion .