Also known as: Thyroid Carcinoma, Medullary / Medullary carcinoma of thyroid / Thyroid Gland Medullary Carcinoma / Thyroid Medullary Carcinoma / Thyroid Cancer, Medullary / Medullary Thyroid Carcinoma / Medullary Thyroid Cancer / Medullary thyroid carcinoma (disorder) / Medullary carcinoma with amyloid stroma (morphologic abnormality) / Parafollicular cell carcinoma (disorder) / Medullary thyroid carcinoma (morphologic abnormality) / C cell neuroendocrine neoplasm / Parafollicular cell carcinoma / C cell carcinoma / Ultimobranchial thyroid tumor / Ultimobranchial thyroid tumour / MTC - Medullary thyroid carcinoma / Medullary carcinoma with amyloid stroma -RETIRED-