Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Interval increase in right upper lobe reticular changes and opacification with associated upper lobe volume loss . Architectural changes in the left perihilar region appear unchanged . Stable cardiomediastinal silhouette . No pneumothorax , pulmonary edema , or pleural effusion . No acute osseous abnormality .
    OUTPUT:
    
Interval increase in right upper lobe reticular changes and opacification , which could represent interstitial fibrosis in progressive chronic sarcoidosis . However , in the appropriate setting , superimposed acute pneumonia can not be excluded .