Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: The cardiac , mediastinal and hilar contours appear unchanged . There is similar widespread opacification involving primarily the right upper lobe . The distribution is quite similar to the prior radiographs , although with decreased density in some areas . There is no definite evidence for a superimposed process , allowing for differences in technique , although the morphology of associated atelectatic changes in the right upper lobe have waxed and waned somewhat in distribution . Volume loss is again noted in the right hemithorax . There is no pleural effusion or pneumothorax .
    OUTPUT:
    
Similar widespread opacification of the right upper lung which can likely be attributed to treatment effect , although a subtle superimposed infectious process is difficult to completely exclude .