Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Upright frontal and lateral chest radiographs demonstrate acute on chronic increase in bibasilar airspace and interstitial opacity concerning for rapidly progressive IPF . There is no definite pulmonary edema . Airspace opacity especially in the right lower lobe could reflect pneumonia . The cardiac silhouette and mediastinal contours are grossly unchanged . There is no pneumothorax . A hiatal hernia has been repaired .
    OUTPUT:
    
Acute on chronic increase in airspace and interstitial abnormality concerning for rapidly progressive IPF . Airspace opacity in the right lower lobe may represent pneumonia .