Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: There is interstitial thickening at the bases bilaterally , and of the right middle lobe seen on the lateral , which are largely unchanged in comparison to the prior chest radiograph . The lungs are hyperinflated , but otherwise clear . Heart size is normal . The mediastinal and hilar contours are normal . The pulmonary vasculature is normal . No pleural effusion or pneumothorax is seen . There are no acute osseous abnormalities .
    OUTPUT:
    
Unchanged interstitial thickening of bilateral bases and right middle lobe due to fibrosis and bronchiectasis seen on prior chest CT . With these changes , it is difficult to exclude underlying pneumonia . No new areas of opacification .