<prompt> Which malignancy would occur in prolonged multinodular goitre:Papillary CaFollicular CaAnaplastic CaMedullary Ca  <response>: Ans. is b ie Follicular Ca In a multinodular goitre carcinoma is rare and is usually of follicular pattern.Other important points about thyroid malignancy:MC type of thyroid cancer after radiation - Papillary CaLatent period for radiation induced thyroid Ca - about 30 yrs Type of thyroid cancer assoc with MEN synd - Medullary CaThyroid Ca assoc with amyloidosis - Medullary CaThyroid Ca assoc with dystrophic calcification - PapillaryPsammoma bodies are seen in - Papillary CaOrphan Annie-eyed nuclei are seen in - papillary CaBest prognosis of which thyroid Ca - Papillary CaCarcinoma derived from the C cells of thyroid - Medullary 