Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Lung volumes are lower . Retrocardiac opacity is likely atelectasis . The heart is top - normal in size , unchanged . The mediastinum is not widened . No edema no pleural effusion , pneumothorax , or focal consolidation .
    OUTPUT:
    
No focal pneumonia . Atelectasis and low lung volumes .