Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Portable semi-erect chest radiograph ___ at 04 : 10 is submitted .
    OUTPUT:
    
Endotracheal tube , feeding tube , and right internal jugular central line are unchanged in position . Overall cardiac and mediastinal contours are likely stable . There is persistent volume loss in the left lower lung and the right lung remains hyperexpanded . Overall , however , there is some improved aeration at the left base . No pulmonary edema . No pneumothorax .