This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Thyroid Malignancies, Subject name: Surgery
Which malignancy would occur in prolonged multinodular goitre: 
Select and explain. 
A. Papillary Ca, B. Follicular Ca, C. Anaplastic Ca, D. Medullary Ca
B: Follicular Ca
Answer: B: Follicular Ca 
Explanation: 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 Ca*Latent period for radiation induced thyroid Ca - about 30 yrs *Type of thyroid cancer assoc with MEN synd - Medullary Ca*Thyroid Ca assoc with amyloidosis - Medullary Ca*Thyroid Ca assoc with dystrophic calcification - Papillary*Psammoma bodies are seen in - Papillary Ca*Orphan Annie-eyed nuclei are seen in - papillary Ca*Best prognosis of which thyroid Ca - Papillary Ca*Carcinoma derived from the C cells of thyroid - Medullary*