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CT-Scans of the thorax: A. Axial view and B. Sagittal view showing less than 5 mm residual tracheal lumen (1.) due to an endotracheal metastasis (2.) on the level of aortic arch (3.). 4. and 5. denote the vertebra and the sternum, respectively. 6. and 7. show the tracheal lumen above the obstruction and the lungs parenchyma, respectively.
