Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Re - demonstrated linear opacity extending laterally from the left hilum , most consistent with atelectasis and / or scarring . Patchy left base opacity has improved in the interval with small residua remaining . The right lung base also appears improved . Subtle reticular nodular opacities in the right mid lung , right perihilar region again seen , possibly related to small airways disease . No pleural effusion or pneumothorax is seen . Cardiac and mediastinal silhouettes are stable and unremarkable . Prominence of the left hilum persists which could relate to underlying lymphadenopathy .
    OUTPUT:
    
Patchy bibasilar opacities improved in the interval with possible slight residual remaining . Persistent reticular nodular subtle opacity the right midlung , perihilar region could be due to small airways disease . Again seen prominent left hilum could relate to underlying lymphadenopathy .