Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Mild enlargement of cardiac silhouette is re - demonstrated , not substantially changed in the interval . The mediastinal and hilar contours are normal . Lungs are clear . No pleural effusion or pneumothorax is seen . There are no acute osseous abnormalities .
    OUTPUT:
    
Unchanged mild cardiomegaly . No acute cardiopulmonary abnormality .