Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: The heart is mildly enlarged . The mediastinal and hilar contours appear unchanged . There is a reticular abnormality in the right lower lung , particularly in the right lower lobe . Although interstitial opacification appears very similar on the lateral view , opacification in the right cardiophrenic angle appears somewhat increased , possibly due to a worsening underlying interstitial process . Other possibilities include increasing atelectasis associated both with an eventration of the hemidiaphragm and a prominent pericardial fat pad , developing bronchopneumonia is also a possibility . There is no pleural effusion or pneumothorax . Bony structures are unremarkable .
    OUTPUT:
    
Patchy right infrahilar opacity superimposed on previously seen interstitial lung disease . Differential considerations for this appearance include worsening interstitial lung disease with or without superimposed developing pneumonia versus atelectasis associated with elevation of the right hemidiaphragm . Correlation with clinical symptoms and laboratory data is recommended . Short - term followup radiographs may be helpful to evaluate further if clinically indicated and if a potential source for infection is not otherwise identified .