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 . Bibasilar opacities may reflect atelectasis , however aspiration or pneumonia could be considered in the appropriate clinical setting . There is a probable small left pleural effusion . The mediastinum appears somewhat wide , which may relate to portable supine technique . There is no pneumothorax . The endotracheal tube ends 3 .7 cm from the carina . A nasogastric tube courses into the stomach , which appears distended with gas . Right subclavian central venous line ends in the upper right atrium .
    OUTPUT:
    
1 . Bibasilar opacities may reflect atelectasis , however aspiration or pneumonia could be considered in the appropriate clinical setting . 2 . Apparent widening of the mediastinum may relate to portable supine technique . 3 . Right subclavian central venous line ends in the upper right atrium and could be pulled back 1 - 2 cm for optimal position .