A 40 year-old man, Ron McNab, has a 3 cm soft, non-fixed thyroid nodule found on routine physical examination. No lymph nodes are palpable. He has no local symptoms, including no hoarseness.
What two questions should be asked on history to see if he has an increased risk of malignancy?
What is his risk of malignancy in the nodule if the answer to the above questions is “no”?
What is the likeliest diagnosis?
How would you investigate him?