Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: There are diffuse airspace opacities spanning nearly the totality of both lungs , with some sparing of an ill - defined region in the right upper lung . The cardiomediastinal and hilar contours are unremarkable . There is no pleural effusion or pneumothorax .
    OUTPUT:
    
Bilateral opacities occupying nearly the totality of the lungs consistent with acute pulmonary edema . Diffuse reactive inflammatory process such as pneumonitis or infection can not be excluded .