Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Diffuse interstitial fibrosis is present compatible with provided history of idiopathic pulmonary fibrosis . Difficult to exclude a superimposed pneumonia especially in the absence of baseline prior chest radiograph . No large effusion or pneumothorax . Heart size is difficult to assess . Bony structures appear grossly intact .
    OUTPUT:
    
Interstitial fibrosis . Difficult to exclude a superimposed pneumonia .