Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: AP portable upright view of the chest . External pacer wires are present . An endotracheal tube , left IJ catheter , Swan Ganz catheter , and orogastric tube are unchanged in position . A small left pleural effusion remains stable . Bibasilar opacities likely reflect atelectasis . There is continued mild pulmonary vascular congestion , with improvement of mild pulmonary edema since the ___ study . There is no pneumothorax .
    OUTPUT:
    
Improvement of mild pulmonary edema and vascular congestion since ___ . Unchanged small left pleural effusion .