Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Single portable view of the chest demonstrates normal lung volumes . No pleural effusion , focal consolidation or pneumothorax . Hilar and mediastinal silhouettes are unremarkable . Heart size is normal . Bibasilar opacities are improved from prior exam . No pulmonary edema . Endotracheal tube terminates 5 cm from the carina . Nasogastric tube is in the stomach .
    OUTPUT:
    
Bibasilar opacities , which may represent aspiration or atelectasis , are improved from ___ exam .