NCIt related terms : Stage IVB Thyroid Gland Medullary Cancer;
NCIt definition : Stage IVB includes: T4b, Any N, M0. T4b: Very advanced disease; tumor of any size
with extension towards the spine or into nearby large blood vessels, invading the
prevertebral fascia, or encasing the carotid artery or mediastinal vessels. M0: No
distant metastasis. (from AJCC 8th Ed.);