Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: A right - sided port ends in appropriate position . Tracheostomy and thoracic and abdominal aortic stents are again seen and unchanged . Again seen are bilateral diffuse parenchymal opacities that appear similar to ___ . There may be tiny bilateral pleural effusions . No pneumothorax .
    OUTPUT:
    
Unchanged diffuse bilateral parenchymal opacities may represent mild pulmonary edema ; however , infection is difficult to rule out .