Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Portable AP upright chest radiographs demonstrate diffuse bilateral pulmonary airspace opacity concerning for pulmonary edema . Please note , underlying infection can not be excluded . Heart size is in the enlarged . No large effusion or pneumothorax . Visualized osseous structures are unremarkable .
    OUTPUT:
    
Cardiomegaly with severe pulmonary edema . Underlying infection not excluded .