Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: The lung volumes remain low . There is interval improved aeration at the bilateral lung bases from the most recent prior study . Small bilateral pleural effusions and evidence of elevated central venous pressure persist . No pneumothorax is present . There is persistent mild bibasilar atelectasis . The cardiomediastinal silhouette is prominent , related in part to low lung volumes and technique , but stable . A nasogastric tube is seen coursing below the diaphragm and out of view on this image . Subcutaneous emphysema is redemonstrated over the right supraclavicular region . Degenerative changes at the bilateral acromioclavicular joints are also noted .
    OUTPUT:
    
1 . Improved aeration at the bilateral lung bases with mild persistent atelectasis . 2 . Small bilateral pleural effusions and evidence of elevated central venous pressure .