Revised thyroid cancer guidelines from the American Thyroid Association call for less use of fine-needle aspiration and of radioiodine, based on evidence that in some circumstances, more treatment did not necessarily yield better outcomes.Under the new guidelines, "fewer people are going to have a biopsy of their thyroid nodule because we now have ultrasound-based criteria for which nodules should be biopsied, not just based on the size of the nodule but on the way they look on ultrasound," Dr. David...