Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: AP view of the chest provided . Compared to prior study , the degree of diffuse interstitial opacity is largely unchanged . However , more confluent opacity in the left lung base is seen , which could suggest atelectasis versus developing pneumonia . No large pleural effusions are seen . Chronic dislocation of the right shoulder is again noted .
    OUTPUT:
    
1 . Largely unchanged diffuse interstitial abnormality , likely chronic interstitial lung disease . 2 . Left lung base opacity , can not exclude superimposed atelectasis or developing pneumonia .