Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: As compared to the prior examination dated ___ , there has been no significant interval change . There is persistent hyperexpansion of the right lung secondary to emphysema . Significant left lower lobe atelectasis and near - complete collapse is stable . The upper lungs are grossly clear bilaterally . The cardiomediastinal silhouette is unchanged in appearance .
    OUTPUT:
    
Persistent , severe left lower lobe consolidative opacity likely represents near - complete lobar collapse , although superimposed infection is difficult to exclude .