Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Frontal and lateral views of the chest were obtained . There are low lung volumes . There are diffuse bilateral pihilar air spaceopacity , consistent with pulmonary edema , underlying infection process can not be excluded . There is no pleural effusion or pneumothorax . The cardiac silhouette is top normal .
    OUTPUT:
    
Pulmonary edema . Underlying infectious process can not be excluded .