Thyroid carcinoma secreting ACTH: (A) Follicular ca, (B) Medullary ca, (C) Papillary ca, (D) Anaplastic ca
Answer is B. Ans. (b) Medullary caMedullary Cancer Thyroid:* 5% of thyroid cancers* Arises from Parafollicular C cells which are derived from Ultimobranchial Bodies.* Mc Site is supero lateral* C cells secrete CALCITONIN* Secretes ACTH, Serotonin, Calcitonin, CEA, Histaminidases, PG E2 and PGF2 Alpha.* FNAC showing amyloid is diagnostic