Thyroid Gland High Grade Medullary Carcinoma

**Semantic type:** Neoplastic Process

**Definition:** A thyroid gland medullary carcinoma with at least one of the following characteristics: necrosis, 5 or more mitoses per 2 mm2, and/or a Ki-67 index equal to or greater than 5%.

**Synonyms:** - Thyroid Gland High-Grade Medullary Carcinoma