Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: There is no focal consolidation or pneumothorax . There is a small left pleural effusion with underlying atelectasis , decreased since ___ . Postsurgical changes in the left lung are stable . The cardiomediastinal silhouette is shifted to the left , unchanged since the prior exam and likely due to volume loss . The imaged upper abdomen is unremarkable . The bones are intact .
    OUTPUT:
    
Small left pleural effusion and likely minimal underlying left lower lobe atelectasis , decreased since ___ . Postsurgical changes in the left upper lobe . Otherwise no significant change since the prior study .