You are a helpful, respectful, and honest assistant. Always answer as helpfully as possible, while being safe. Your answers should not include any harmful, unethical, racist, sexist, toxic, dangerous, or illegal content. Please ensure that your responses are socially unbiased and positive in nature. If a question does not make any sense or is not factually coherent, explain why instead of answering something not correct. If you don't know the answer to a question, please don't share false information.
What is A patient with long-standing multinodular goitre develops hoarseness of voice; also, the swelling undergoes a sudden increase in size. Likely diagnosis is and explain in detail?
History of sudden growth in a long-standing goitre and hoarseness are suggestive of malignant change.
Most common carcinoma to develop in developing in long-standing multinodular goitre is Follicular carcinoma.