Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Single frontal AP view of the chest provided with patient positioned upright . A dialysis catheter is again seen extending into the right atrium . The heart remains markedly enlarged . Pulmonary edema persists with increase in confluent opacity at the right lower lung which could represent a superimposed pneumonia . No effusion or pneumothorax seen . Mediastinal contour is stable . Bony structures are intact .
    OUTPUT:
    
Diffuse pulmonary edema with increased confluence of opacity in the right lower lung , raising potential concern for a superimposed pneumonia .