Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Frontal and lateral chest radiographs demonstrate unremarkable mediastinal contours . There is stable mild cardiomegaly . There is prominence of the central pulmonary vasculature suggesting mild background pulmonary edema . Increased opacification in the right lower lung evident on both the frontal and lateral radiographs suggests pneumonia . No pleural effusion or pneumothorax evident .
    OUTPUT:
    
On a background of mild pulmonary edema , right lower lung pneumonia . Stable mild cardiomegaly .