Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Compared to chest radiographs from ___ , there has been interval development of an air - fluid level within the right axilla containing surgical clips , which could represent a developing fluid collection or abscess . Upper mediastinal widening has improved , consistent with probable evolving postoperative hematoma . Tiny bilateral pleural effusions are unchanged . Bibasilar atelectasis has improved . Moderate cardiomegaly is stable .
    OUTPUT:
    
1 . New air - fluid level within the right axilla containing surgical clips , concerning for a developing fluid collection or possible abscess . 2 . Improved upper mediastinal widening , consistent with probable evolving postoperative hematoma . 3 . Stable tiny bilateral pleural effusions . Stable moderate cardiomegaly . 4 . Improved bibasilar atelectasis .