Does the third grade change to fourth grade?

Thyroid nodules are classified into three categories, three is the largest level, normal refers to thyroid enlargement more than sternocleidomastoid muscle. Thyroid nodules classification, there are three and four categories, and three will also develop to four categories, the higher the normal classification of thyroid nodules, the higher the malignant degree. If the classification of thyroid nodules, from three to four categories, must be alert to the possibility of malignancy, it is recommended to fine needle puncture, pathological examination.