Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Portable AP chest radiograph . Tracheostomy tube , right - sided tunneled HD catheter , and left - sided PICC are all in stable position . Pulmonary edema has continued to improve and now is minimal . However , retrocardiac opacification persists . There is no large pleural effusion or pneumothorax . The heart size is normal .
    OUTPUT:
    
Improving pulmonary edema with persistent retrocardiac opacification which again raises concern for pneumonia .