Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Portable semi-upright radiograph of the chest demonstrates low lung volumes which results in bronchovascular crowding . Mild bibasilar atelectasis is present . Widening of the superior mediastinum is exaggerated secondary to patient positioning . A right - sided central line ends in the left subclavian vein . The nasogastric tube ends in the mid esophagus , at the level of the carina .
    OUTPUT:
    
1 . Mild bibasilar atelectasis . 2 . Right - sided central line ends in the left subclavian vein . 3 . Nasogastric tube ends in the mid esophagus , at the level of the carina .