Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Cardiac size is normal . The aorta is elongated . There is an abnormal radiolucency at the thoracic inlet / mid-line , better evaluated in concurrent CT . There is no pleural effusion or pneumothorax . The lungs are well expanded and clear without focal consolidation concerning for pneumonia . The upper abdomen is unremarkable .
    OUTPUT:
    
Abnormal superior mediastinum better evaluated in concurrent CT .