Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: All support devices have been removed . Extensive bilateral airspace opacities have minimally improved since the study of 3 days prior , particularly in the left upper lobe . However , the background of fine reticular interstitial opacities is unchanged . Lung volumes remain low . There is no pneumothorax . Moderate cardiomegaly despite the projection is unchanged . Small pleural effusions are unchanged .
    OUTPUT:
    
Slightly improved aeration of the left upper lobe , which may be due to resolving pulmonary edema or IPF exacerbation . Otherwise no significant interval change in severe pulmonary fibrosis , which has progressed since ___ .