Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: As compared to chest radiograph dated ___ . There is slightly decreased opacification of the right hemi thorax with slight improvement in aeration . There is a small catheter projecting over the right lower hemi thorax , which may represent a Pleurx drainage catheter . There is no pneumothorax . There is no free intra-abdominal air .
    OUTPUT:
    
Status post right thoracentesis , with slight decrease in right hemi thorax opacification , however , the majority of the right hemi thorax remains opacified .