Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Compared to the prior study there appears to been some interval improvement in the previously seen the layering left - sided pleural effusion . No definite right - sided effusion seen . A left - sided chest tube remains in - situ . An endotracheal tube and nasogastric tube are also unchanged in appearance . A Swan - Ganz catheter is unchanged in position , this appears to be in the region of the pulmonary valve / main pulmonary artery . The right lung appears grossly clear . A right internal jugular catheter is unchanged in appearance . No pneumothorax seen .
    OUTPUT:
    
Slight interval improvement in in the left - sided pleural effusion .