Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Portable AP upright chest radiograph was obtained . Despite low lung volumes , vascular fullness and interstitial septal thickening suggest mild pulmonary edema . The heart is stably enlarged with a calcified aortic contour . No focal consolidation , pleural effusion or pneumothorax is identified , though the right costophrenic angle is not well evaluated and small effusion can not be excluded .
    OUTPUT:
    
Mild pulmonary edema .