Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: AP upright and lateral chest radiograph demonstrate low lung volumes . There is central vascular engorgement and cardiomegaly , the latter probably exaggerated by low lung volumes . No focal opacity is identified . No over pulmonary edema is seen . There is no large pleural effusion . No pneumothorax . No air under the right hemidiaphragm .
    OUTPUT:
    
Enlarged cardiac silhouette and central vascular engorgement likely accentuated by low lung volumes . Superimposed pulmonary vascular congestion is possible .