Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Frontal and lateral radiographs of the chest show mildly improved , but persistent bibasilar opacification on the left worse than the right , but not obscuring the heart borders . A small left pleural effusion is present . No pneumothorax is seen . The pulmonary vasculature is not engorged . The cardiac silhouette is normal in size . The mediastinal and hilar contours are within normal limits and unchanged .
    OUTPUT:
    
Mildly improved , but persistent pulmonary edema or , in the correct clinical context , bibasilar pneumonia ( including atypical , viral or PCP pneumonia___ ) .