Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Focal opacity in the right mid lung zone seen on prior radiograph is no longer present and was most likely due to atelectasis . There are no new parenchymal opacification , pleural effusion or pneumothorax . Right PICC line , ET tube and NG tube are stable in position . Cardiomediastinal silhouette is normal .
    OUTPUT:
    
Interval resolution of right mid lung atelectasis .