Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: The heart size is normal . The hilar and mediastinal contours are unremarkable . The lungs are well expanded and clear . There is no pleural effusion or pneumothorax . The visualized osseous structures are unremarkable . Of note , there is an impression in the right superior portion of the trachea which may be secondary to a thyroid abnormality .
    OUTPUT:
    
1 . No acute abnormalities identified . 2 . Impression on the right side of the trachea , likely secondary to a thyroid abnormality .