Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: The cardiac silhouette is stably enlarged . Pulmonary edema has substantially improved since most recent examination . Right pleural effusion is decreased in size . Again seen is dense left retrocardiac opacity , which may relate atelectasis . A persistent airspace opacity is present in the right upper lobe . .
    OUTPUT:
    
1 . Improved pulmonary edema . 2 . Persistent opacity in the right upper lobe , which may be related to residual asymmetric edema or a focus of infectious pneumonia .