Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: AP view of the chest provided . As compared to prior chest radiograph from earlier today , there is little change in the left lung base atelectasis and left pleural effusion . Right base atelectasis is unchanged . Postoperative cardiomediastinal silhouette is larger since ___ , but is unchanged since earlier today .
    OUTPUT:
    
Slight increase in cardiomediastinal silhouette since immediate postoperative image from ___ , but is unchanged since earlier today .