Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: COMPARED TO ___ , the right upper lobe pneumonia has improved . The right lower lung opacity , obscuring the hilum , is unchanged and likely due to infection . A heterogeneous left upper lobe opacification and left pleural effusion and worsened left lung aeration are new . The small left pleural effusion is unchanged .
    OUTPUT:
    
1 . Improved , but not yet resolved , right upper lobe pneumonia . 2 . Right lower lung opacity and new heterogeneous left upper lobe opacity suggest chronic aspiration . 3 . Unchanged small left pleural effusion .