Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Compared with the immediate prior study of ___ , there is little relevant change . Significant enlargement of the pulmonary arteries is unchanged , bilateral diffuse airspace opacities are compatible with moderate to severe edema , also unchanged . The left base pigtail catheter is in unchanged position . No pleural effusion . There is no definite pneumothorax . The heart is stably moderately enlarged .
    OUTPUT:
    
1 . Unchanged severe pulmonary arterial enlargement , and moderate to severe diffuse airspace opacities , compatible with edema . 2 . No pleural effusion .