Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Again visualized is a small opacity at the left lung base which on today 's study is in the retrocardiac area . This was not present on the CT torso on ___ . There remains a right pleural effusion and right base opacifications which are stable compared to yesterday 's film . The cardiomediastinal silhouette remains stable .
    OUTPUT:
    
1 . Left lung base nodule . This does not represent a nipple shadow . CT scan should be obtained for better characterization of this finding . 2 . Stable right basilar opacification and right pleural effusion .