Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: There is subtle opacity linear opacity in the lingula , slightly more prominent from the previous examination , favoured to represent atelectasis . There is no pleural effusion or pneumothorax . The cardiomediastinal silhouette is unremarkable .
    OUTPUT:
    
Increasing linear opacity in the lingula , favored to represent atelectasis rather than pneumonia .