Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: A single portable semi-erect frontal chest radiograph was obtained . There are bilateral airspace opacities throughout the mid and lower left lung and medial lower right lung most likely reflecting pulmonary edama , although pneumonia or aspiration should also be considered . The cardiac or mediastinal contours are stable . There are no pleural effusions or pneumothorax .
    OUTPUT:
    
Bilateral airspace opacities most likely represent asymmetric pulmonary edema . Multifocal infection can not be excluded .