Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Portable semi-upright radiograph of the chest demonstrates low lung volumes and a borderline enlarged cardiac silhouette . The mediastinal contours are stable since the prior examinations . New in the interval are pulmonary vascular congestion and bilateral , asymmetrically distributed perihilar opacities as well as a more focal opacity in the right upper lobe . Superimposed infection is not excluded . Midline sternal wires are well aligned and intact .
    OUTPUT:
    
Findings likely due to asymmetrical pulmonary edema , although superimposed secondary process such as aspiration or infectious pneumonia are possible . Followup radiographs after diuresis may be helpful in this regard , especially to assess for clearance of a more focal opacity in the right upper lobe .