Papillary, Follicular, Hurthle Cell, Poorly Differentiated, and Anaplastic Thyroid Carcinoma pT3b TNM Finding v8

**Semantic type:** Finding

**Definition:** Gross extrathyroidal extension invading only strap muscles (sternohyoid, sternothyroid, thyrohyoid, or omohyoid muscles) from a tumor of any size. (from AJCC 8th Ed.)

**Synonyms:** - Differentiated and Anaplastic Thyroid Carcinoma pT3b TNM Finding v8 - pT3b