Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Heart size remains mildly enlarged . Mediastinal and hilar contours are unchanged and within normal limits . Pulmonary vascularity is normal . Lungs are clear . No pleural effusion or pneumothorax is demonstrated . Clips from prior thyroid surgery are seen within the right neck .
    OUTPUT:
    
No acute cardiopulmonary abnormality .