Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Patchy lingular opacity is seen which could be due to atelectasis versus infectious process in the appropriate clinical setting . Perihilar peribronchial thickening is noted . The right lung is clear . The lungs are relatively hyperinflated , suggesting chronic obstructive pulmonary disease . No pleural effusion or pneumothorax is seen . The cardiac silhouette is mildly enlarged . Mediastinal contours are unremarkable .
    OUTPUT:
    
Patchy lingular opacity , atelectasis versus infection . Left perihilar peribronchial wall thickening .