Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Lung volumes are low . Left lower lobe atelectasis has improved from prior examination . Bibasilar opacities and mild pulmonary edema remain . There is increased right lower lobe atelectasis . A small left pleural effusion is stable . Left apical bulla without pneumothorax . Endotracheal tube is stable .
    OUTPUT:
    
1 . Improved left lower lobe atelectasis . 2 . Bibasilar opacities may reflect atelectasis in or aspiration pneumonia .