A 45-year-old woman has a thyroidectomy because of asymmetric enlargement of the thyroid gland, first noticed during a physical examination 6 weeks ago. She underwent an adrenalectomy for pheochromocytoma 3 years ago. Microscopically, the bilateral thyroid lesions are composed of spindle cells arranged in small clusters. Deposits of amyloid are present between neoplastic cells. Foci of C-cell hyperplasia are also present. The lesions are confirmed as malignant. Which of the following markers is most appropriate to monitor for the development of recurrence of the thyroid neoplasm?
A) Calcitonin
B) a-Fetoprotein
C) Human chorionic gonadotropin
D) Norepinephrine
E) Thyroid-stimulating hormone
A 45-year-old woman has a thyroidectomy because of asymmetric enlargement of the thyroid gland, first noticed during a p
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