Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Lung volumes are within normal limits . The trachea is central . The cardiomediastinal contour is unchanged . There is increased airspace opacity at the right lung base , progressed when compared to the prior study . Persistent left basilar airspace opacity . Is also involvement of the right upper lobe . Appearances are consistent with pulmonary edema . Prominence of the bilateral hila is unchanged . No definite pleural effusion seen .
    OUTPUT:
    
Progression of the airspace opacities consistent with bilateral pulmonary edema .