Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: This study is essentially unchanged from prior . The lung volumes are stably low . There are no pleural effusions . There is stable mild - to - moderate pulmonary edema . No evidence of pneumonia . NG tube is observed again in place and unchanged in position .
    OUTPUT:
    
The study is essentially unchanged from prior . No evidence of pneumonia .