Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: A single frontal upright view of the chest was obtained portably . Heterogeneous opacity at the right lung base may represent pneumonia or aspiration . There is no pleural effusion or pneumothorax . Pulmonary vasculature is engorged and the azygous vein is larger . The cardiac silhouette is larger than on the prior study . Mediastinal silhouette and hilar contours are normal . There is no free air under the diaphragm .
    OUTPUT:
    
1 . Right lower lung opacity may represent pneumonia or aspiration . 2 . Mild heart failure .