Thyroid Gland Mixed Medullary and Follicular Cell-Derived Carcinoma

**Semantic type:** Neoplastic Process

**Definition:** A primary carcinoma of the thyroid gland containing a medullary carcinoma component that is immunohistochemically positive for calcitonin, and follicular cell-derived carcinoma component that is immunohistochemically positive for thyroglobulin.

**Synonyms:** - MMFCC - Mixed Medullary and Follicular Cell-Derived Thyroid Carcinoma