Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Portable semi-upright chest radiograph demonstrates perihilar airspace opacities , and a small though increased right pleural effusion . Lung volumes are low . The cardiac silhouette remains moderately enlarged , the mediastinal contours are notable for calcification of the aortic knob and marked central venous engogement .
    OUTPUT:
    
Lower lung volumes , with increase in moderate pulmonary edema and a small though increased right pleural effusion . Moderate cardiomegaly , unchanged .