label: Stage IVB Differentiated Thyroid Gland Carcinoma AJCC v7
label_lc: stage ivb differentiated thyroid gland carcinoma ajcc v7
description: Stage IVB includes: T4b, Any N, M0. T4b: Very advanced disease.  Tumor invades prevertebral fascia or encases carotid artery or mediastinal vessels.  M0: No distant metastasis. (AJCC 7th ed.)