Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Portable upright chest radiograph ___ 11 : 12 is submitted .
    OUTPUT:
    
Right internal jugular large bore dual lumen catheter is unchanged in position . The heart remains stably enlarged . Mediastinal contours are unchanged . There continues to be layering left effusion with patchy opacity at the left base likely reflecting compressive atelectasis , although pneumonia can not be entirely excluded . Aeration at the right base is improving suggestive of resolving atelectasis . No pneumothorax . No pulmonary edema .