Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: In comparison to the chest radiograph obtained 1 day prior , the moderate right pleural effusion has decreased in size , now small with less associated right basilar atelectasis . A right - sided pigtail drainage catheter is unchanged in position . No pneumothorax . Lungs are otherwise clear without focal consolidations . Heart size is normal . Cardiomediastinal hilar silhouettes are unchanged .
    OUTPUT:
    
Decreased , now small , right pleural effusion with less associated atelectasis .