Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Rounded opacity adjacent to the left hilus has decreased in size , although persistent . This can be residual hemorrhage or localized fluid . Postoperative changes in the left lung with associated volume loss . The right lung is clear . No pleural effusions or pneumothorax .
    OUTPUT:
    
Interval decrease in left hilar rounded opacity may reflect resolving hematoma or fluid .