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Case Reports
Journal Article
Calcitonin-Negative Neuroendocrine Tumor of the Thyroid.
International Journal of Surgical Pathology 2017 April
Neuroendocrine tumors (NETs) of the thyroid are rare; the most common type is medullary thyroid carcinoma (MTC). They are derived from parafollicular cells (C-cells) that usually express calcitonin, chromogranin, and carcinoembryonic antigen. Calcitonin-negative NETs of the thyroid are extremely rare, and the origin of these tumors is unclear. Whereas some believe that these tumors are from follicular cells, recent reports have shown expression of calcitonin gene-related peptide in these tumors, indicating parafollicular C-cell origin. Here, we report a case of calcitonin-negative NET of the thyroid in a 74-year-old woman, with review of the literature.
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