Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Portable upright chest radiograph ___ at 09 :02 is submitted .
    OUTPUT:
    
Left pleural basilar pigtail catheter remains in place . No definite pneumothorax is seen . There is persistent retrocardiac opacity with an associated layering effusion likely reflecting lower lobe atelectasis , although pneumonia can not be excluded . Faint opacity at the right base appears somewhat improved suggestive of resolving atelectasis in the setting of low lung volumes . No pulmonary edema . Stable cardiac enlargement .