Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: The lung volumes remain low . There is improved aeration of the upper lung zones from ___ with persistent diffuse bilateral parenchymal opacities . No significant pleural effusion or pneumothorax is appreciated . There is pulmonary venous congestion . The cardiomediastinal silhouette is prominent but decreased in size from ___ . An endotracheal tube and enteric tube are unchanged in position .
    OUTPUT:
    
Improved aeration of the upper lungs with persistent bilateral parenchymal opacities may reflect an improved component of pulmonary edema . Improvement in ARDS is difficult to ascertain .