Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: The lung volumes are low , which likely exacerbate the worsened appearance of diffuse interstitial abnormality in comparison to prior studies . However , the worsened appearance could also in part reflect progression of known pulmonary fibrosis ( per OMR notes , demonstrated on prior Atrius CT ) , or superimposed interstitial edema or widespread atypical infectious process . There is no associated effusion or pneumothorax . Hilar and cardiomediastinal contours are unchanged . Mild thoracic degenerative change .
    OUTPUT:
    
Worsened diffuse interstitial abnormality compared to prior studies , which could reflect progression of chronic interstitial lung disease versus superimposed interstitial edema or atypical infectious process .