Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Portable supine chest film ___ at 04 : 58 is submitted .
    OUTPUT:
    
Nasogastric tube seen coursing below the diaphragm . Right internal jugular central line and endotracheal tube are unchanged in position . Lung volumes remain low . There has been interval increase in bibasilar patchy opacities most likely reflecting increasing atelectasis , although pneumonia or aspiration should be considered . Possible small layering left effusion . No pneumothorax . Cardiac and mediastinal contours are unchanged given differences in patient positioning .