Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Single right chest tube . Stable moderate right pleural effusion . Right basilar opacity has mildly improved . More prominent retrocardiac opacity , likely atelectasis . There is no left pleural effusion . There is no pneumothorax . Stable right perihilar fullness , indeterminate .
    OUTPUT:
    
Stable moderate right pleural effusion .