Medullary Thyroid Carcinoma (often called MTC) is also one of the types of medullary thyroid carcinomas that starts in specific cells of the thyroid gland called parafollicular cells (C cells).

Numerous secretory granules were present in the cytoplasm of the neoplastic cells, which closely resembled thyroid parafollicular cells. Thyrocalcitonin-like activity was demonstrated in the ...