Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Portable semi-erect chest radiograph ___ at 03 :52 is submitted .
    OUTPUT:
    
Endotracheal tube , nasogastric tube , and right internal jugular large bore catheter are unchanged in position . Overall cardiac and mediastinal contours are stable . There is improving aeration in the retrocardiac region . There is a layering right effusion with some improved aeration at the right base as well . These findings are suggestive of resolving atelectasis . No pulmonary edema . No pneumothorax .