Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Moderate cardiomegaly , mediastinal silhouette and hilar contours are unchanged from prior exam . There is persistent mild pulmonary edema and in this setting is difficult to discretely identify pneumonia . Bibasilar patchy opacities are relatively unchanged compared to prior exam . There is no pleural effusion or pneumothorax .
    OUTPUT:
    
Unchanged pulmonary edema with no change in appearance of bibasilar patchy opacities . Infection is not excluded given the correct clinical circumstance .