All solid nodules more than 10 mm in diameter will be biopsied by FNA if there is only one such nodule or if there are no more than three such nodules. Only the largest nodule and nodules with suspect characteristics on ultrasound will be controlled by FNA if there are more than three nodules exceeding 10 mm in diameter. The procedure adopted depends on the individual nodule. Decisions concerning surgery are based on the most severe diagnosis obtained if several nodules are assessed.