Stage IVB Thyroid Gland Anaplastic Carcinoma AJCC v7

**Semantic type:** Neoplastic Process

**Definition:** Stage IVB includes: T4b, Any N, M0. T4b: Anaplastic carcinoma with gross extrathyroid extension. M0: No distant metastasis. (AJCC 7th ed.)

**Synonyms:** - Stage IVB Thyroid Gland Undifferentiated (Anaplastic) Carcinoma AJCC v7 - Undifferentiated (Anaplastic) Stage IVB Thyroid Gland Cancer