Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: The lungs are low in volume and show bilateral lower lobe opacities with small associated effusions . A more well circumscribed opacity along the left chest wall likely represent callus formation around a previously fractured rib . The cardiac silhouette is enlarged . The mediastinal silhouette and hilar contours are normal .
    OUTPUT:
    
Bibasilar atelectasis associated with small effusions .