Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: There is a retrocardiac opacity concerning for infection . There is also mild interstitial edema . The cardiac silhouette is mildly enlarged . There is a small left pleural effusion . Diffuse sclerotic osseous metastases are identified .
    OUTPUT:
    
1 . Retrocardiac opacity concerning for infection . 2 . Mild interstitial edema and small left pleural effusion .