Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Portable AP view of the chest was obtained . Extensive interstitial lung disease is unchanged compared to be prior study performed in ___ . There has been interval development of a relatively confluent opacity in the right middle to lower lung . No pulmonary edema , effusion , or pneumothorax . The cardiomediastinal silhouette is normal . There is no free air below the right hemidiaphragm . No bony abnormalities .
    OUTPUT:
    
Interval development of a relatively confluent opacity in the right middle to lower lung concerning for pneumonia superimposed on chronic interstitial lung disease .