Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: The patient is status post median sternotomy . Heart size is normal . The mediastinal and hilar contours are normal . The pulmonary vasculature is normal . There is a rounded , mediastinal opacity seen anterior to the heart , best seen on the lateral view , which was not seen on the prior examination . No pleural effusion or pneumothorax is seen .
    OUTPUT:
    
1 . No evidence of pneumonia . 2 . Anterior mediastinal rounded opacity , not seen on the prior chest radiograph . Recommend further evaluation with CT when clinically appropriate .