Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Extensive lobulated widening of the anterior superior mediastinum is highly concerning for a mass . Heart size is normal . The aorta is tortuous . The pulmonary vasculature is normal . Lungs are clear . No pleural effusion or pneumothorax is seen . S - shaped scoliosis of the thoracolumbar spine is present . No acute osseous abnormalities demonstrated .
    OUTPUT:
    
Large anterior mediastinal mass . Further assessment with contrast - enhanced CT is recommended .