Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Frontal and lateral chest radiographs demonstrate a an unchanged cardiomediastinal silhouette and persistently low lung volumes . Bilateral pulmonary opacities are decreased compared to the most recent chest radiograph , but there is persistent bibasilar atelectasis . No pleural effusion or pneumothorax is identified .
    OUTPUT:
    
Decreased bilateral pulmonary opacities , with a persistent bibasilar atelectasis .