Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: As compared to the previous radiograph , the endotracheal tube and the nasogastric tube are in unchanged position . Unchanged evidence of extensive parenchymal opacity in the right lung , with extensive air bronchograms . The pre-existing also extensive parenchymal opacity in the left upper lobe has now spread to the remaining left lung and is seen in all parts of the left lung . In addition , there is a moderate retrocardiac atelectasis . The size of the cardiac silhouette is overall unchanged .
    OUTPUT:
    
Constant extensive right lung pneumonia . Increase in severity of left pneumonia .