What grade of thyroid nodule requires surgery is determined from the ultrasound results. There is a clear relationship between ultrasound grading and the nature, boundaries, margins, echogenicity, aspect ratio and presence of calcification of the nodules. Generally speaking, nodules graded below grade 2 or 3 have a higher possibility of benignity, and regular follow-up is recommended, and the chance of malignancy of nodules is less than 5%. relatively safe.