High Grade Follicular Cell-Derived Non-Anaplastic Thyroid Gland Carcinoma

**Semantic type:** Neoplastic Process

**Definition:** A thyroid gland carcinoma that arises from follicular cells and is characterized by the presence of high mitotic activity and necrotic changes in the absence of anaplastic histological features. This category includes poorly differentiated thyroid gland carcinoma and differentiated high-grade thyroid gland carcinoma.

**Synonyms:** - Follicular-Derived Thyroid Gland Carcinoma, High Grade - Follicular-Derived Thyroid Gland Carcinoma, High-Grade - High-Grade Follicular Cell-Derived Non-Anaplastic Thyroid Gland Carcinoma