Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: The cardiac silhouette size is within normal limits . The aorta remains tortuous , but unchanged . Mediastinal and hilar contours otherwise are unremarkable . The pulmonary vascularity is normal . Lungs are clear . No pleural effusion or pneumothorax is present . No acute osseous abnormality is seen .
    OUTPUT:
    
No acute cardiopulmonary abnormality .