Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Portable semi-upright radiograph of the chest demonstrates low lung volumes which result in bronchovascular crowding . Moderate bilateral pleural effusions with adjacent atelectasis are stable . There has been interval improvement in aeration of the bilateral upper lungs . New widening of the superior mediastinum may be related to central line placement , and may represent hematoma or abscess . The central line ends in the right atrium , in unchanged position . Nasogastric tube courses into the stomach and out of the field of view . No pneumothorax .
    OUTPUT:
    
1 . Slight interval improvement in aeration of the bilateral upper lungs , with stable moderate bilateral pleural effusions and adjacent atelectasis . 2 . Interval widening of the superior mediastinum may be related to recent central line placement , and may represent hematoma or abscess . 3 . Endotracheal tube ends 2 cm in the carina and the endotracheal tube cuff appears overinflated . 4 . Central line ends in the right atrium , in unchanged position .