Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: In comparison to ___ , cardiac enlargement has slightly decreased in extent . Pulmonary vascular engorgement persists , but widespread ground - glass opacities have substantially improved , and apparent pleural effusions have resolved . Residual severe diffuse interstitial pulmonary fibrosis remains and has been more fully characterized on recent chest CTA ___ .
    OUTPUT:
    
Marked improvement in diffuse ground - glass opacities , which for likely due to acute pulmonary edema . Widespread pulmonary fibrosis has been more fully characterized by a recent CT .