Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Portable semi-erect chest film ___ at 05 :46 is submitted .
    OUTPUT:
    
Nasogastric tube is seen coursing below the diaphragm with the tip not identified . The endotracheal tube has its tip at the thoracic inlet . Lung volumes remain low with crowding of the pulmonary vasculature and persistent opacity at the left base and an associated left effusion . There is improved aeration in the right mid and lower lung consistent with resolving atelectasis . No pulmonary edema or pneumothorax . Overall cardiac and mediastinal contours are likely unchanged given differences in patient positioning between studies .