PMC6658989_01
Axial view: Large mass within the mediastinum (red arrow) arising from the left lobe of the thyroid, displacing and severely narrowing the trachea (yellow arrow). (For interpretation of the references to colour in this figure legend, the reader is referred to the Web version of this article.)
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It significantly narrowed the trachea to a maximum diameter of roughly 2 mm and displaced it toward the right (Fig. 1, Fig. 2).