Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: A single portable supine chest radiograph was obtained . An endotracheal tube terminates 7 cm above the carina . An orogastric tube extends inferiorly into the stomach . The lungs are well expanded . The moderate right hilar opacity obscures the right hilar contour . Otherwise the cardiac and mediastinal contours are normal . Prominence of upper lobe vasculature indicates mild fluid overload .
    OUTPUT:
    
Right hilar opacity of uncertain etiology . Mild pulmonary venous congestion .