Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: The lungs are normally expanded and grossly clear . Mild enlargement of the cardiac silhouette is chronic . The mediastinal and hilar contours are normal . There is no large pleural effusion or pneumothorax . There is no pulmonary edema .
    OUTPUT:
    
Mild chronic cardiomegaly but no evidence of pneumonia .