Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: A portable frontal chest radiograph demonstrates low lung volumes and a mildly enlarged heart . Diffuse bilateral opacities are consistent with severe pulmonary edema . No large pleural effusion is seen , though difficult to evaluate given overlying opacity . There is no pneumothorax . The visualized upper abdomen is unremarkable .
    OUTPUT:
    
Severe pulmonary edema .