Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Lung volumes are low , accentuating the cardiac silhouette and the pulmonary vasculature and there is mild enlargement of the cardiac silhouette even accounting for low lung volumes . There is mild tortuosity of the thoracic aorta . Hilar contours are unremarkable . Lungs are clear . Pleural surfaces are clear without effusion or pneumothorax . There is no evidence of fluid overload .
    OUTPUT:
    
Mild cardiomegaly without vascular congestion or interstitial edema .