Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Frontal and lateral radiographs of the chest demonstrate stable severe enlargement of the cardiac silhouette . The mediastinal silhouette and hilar contours are normal . The lungs are clear . No pneumothorax . Unchanged small bilateral pleural effusions . No displaced rib fracture identified .
    OUTPUT:
    
1 . Stable severe chronic cardiomegaly . 2 . No pneumonia or pleural effusion .