Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Portable semi-erect chest film ___ at 05 : 50 is submitted .
    OUTPUT:
    
Endotracheal tube and nasogastric tube are unchanged . Overall cardiac and mediastinal contours are stable . There continues to be a layering right effusion with associated airspace opacity at both lung bases , right greater than left , which may represent lower lobe atelectasis or pneumonia . Clinical correlation is advised . No pneumothorax . No evidence of pulmonary edema .