Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: The cardiomediastinal silhouette is normal . The hilar contours are unremarkable . A left nodular opacity may represent trapped pleural fluid versus atelectasis or both . No other focal consolidations are seen . A small left pleural effusion has decreased when compared with ___ study . Right Port - A - Cath unchanged in position with a catheter tip that terminates at the cavoatrial junction .
    OUTPUT:
    
1 . No evidence of pneumonia . 2 . Interval improvement of small pleural effusion . 3 . Left lateral chest wall nodularity which represents pleural fluid versus atelectasis or both .