Aggressive-Appearing Intratracheal Mass in an Older Woman

A woman in her early 70s presents with biphasic stridor and a report of dyspnea on mild exertion. Noncontrast computed tomography of the chest shows a lesion protruding into the right side of the tracheal region that appears to be contiguous with the right lobe of the thyroid gland. Examination of a biopsy specimen shows medullary thyroid cancer. What is your diagnosis?

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