Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Single portable chest radiograph demonstrates stable severe cardiomegaly . Pulmonary edema is persistent though improved , now moderate . Right pleural effusion also decreased , now small in size . Bibasilar atelectasis noted , with progressive minimal increase in retrocardiac space . Right dual - lumen catheter with the most distal tip in the distal SVC and proximal tip in right brachiocephalic vein . Left - sided central venous catheter with tip likely in the left brachiocephalic vein . Endotracheal tube is in standard position . Nasogastric tube is seen passing into the stomach and out of view .
    OUTPUT:
    
Improved aeration of right lung base likely due to decreased pleural effusion . Slightly increased retrocardiac opacity , likely a combination of increased atelectasis .