Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: There is a new subtle patchy opacity at the left base where there is mild blunting of the costophrenic angle , likely atelectasis . There is no other focal consolidation , pleural effusion , or pneumothorax . The cardiomediastinal silhouette is normal . Osseous structures are intact . Clips are seen in the right axilla .
    OUTPUT:
    
Subtle opacity in the peripheral left base likely atelectasis .