Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Status post median sternotomy . A gastric tube extends into the body of the stomach . An epidural wire projects over the right hemithorax . Low bilateral lung volumes . A retrocardiac opacity likely reflects a combination of pleural fluid and atelectasis . Mild pulmonary vascular congestion . No pneumothorax identified . The size of the cardiac silhouette is at the upper limits of normal .
    OUTPUT:
    
Mild pulmonary vascular congestion as well as a retrocardiac opacity likely reflecting a combination of a pleural effusion and atelectasis .