Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: The cardiac silhouette and mediastinum are unremarkable . The pulmonary vasculature is normal . There is no pleural effusion or pneumothorax . In the right infrahilar region , there is progressive opacity in comparison to prior examinations , which may represent developing consolidation . More linear areas of opacity likely represent atelectasis .
    OUTPUT:
    
1 . Possible right middle lobe pneumonia . 2 . Bibasilar atelectasis .