Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: The lungs are clear without focal opacity , pulmonary edema , pleural effusion or pneumothorax . The cardiac size is top normal . The mediastinum is normal . No free air is identified .
    OUTPUT:
    
No free air , pulmonary or pleural abnormalities . Borderline cardiac enlargement is chronic . No pulmonary edema .