Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: The patient is status post recent median sternotomy and cardiovascular surgery . Cardiac silhouette is stable in the postoperative period , but enlarged compared to preoperative study ___ ___ . Multifocal areas of atelectasis in the bilateral mid and left lower lung regions appear relatively similar to the prior radiograph except for slight improvement in the left lower lobe . Small left pleural effusion is unchanged . No visible pneumothorax .
    OUTPUT:
    
Similar postoperative appearance of the chest to ___ , except for slight improvement in left lower lobe atelectasis .