Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: In comparison with the most recent examination , lung volumes slightly lower . The cardiac silhouette is stably enlarged . Again noted is a mild indistinctness of the pulmonary vasculature with superimposed opacities bilaterally , more confluent on the left than previously noted , consistent with superimposed pneumonia .
    OUTPUT:
    
Possible mild edema with superimposed pneumonia .